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1     Mitsch, W.J. and J.G. Gosselink. 1986. WETLANDS.
      Van Nostrand Reinhold Company, Inc. New York. 537 pp.
    
2     Horwitz E L. 1978. OUR NATION'S WETLANDS - AN INTER-AGENCY 
      TASK FORCE REPORT. Council on Environmental Quality. Washington, D.C. 70 pp.
    
3     Stoll, G.H. 1970. Territorial growth (Map).
      Hammond Inc. 1967; rev. by U.S. Geological Survey,
      National Atlas of the United States of America. p. 137.
    
4     U.S. Department of the Interior, Geological Survey. 1970.
      THE NATIONAL ATLAS OF THE UNITED STATES                 
      OF AMERICA. Washington, D.C. 417 pp.                      
   
5     Strickland, J.C. and C. Hayden. 1988. ALABAMA STATEWIDE   
      COMPREHENSIVE OUTDOOR RECREATION PLAN.                  
      Alabama Dept. of Economic and Community Affairs; and   
      Alabama Dept. of Conservation and Natural Resources.     
      Montgomery. 30 pp.                                     
    
6     J.V. Hall. Regional Wetlands Coordinator, U.S. Fish and
      Wildlife service. Anchorage. Personal communication,    
      1990.                                                  
    
7     Alaska Department of Natural Resources. 1987.     
      Alaska Wetlands Addendum to the statewide          
      comprehensive outdoor recreation plan. Division of
      Parks and Outdoor Recreation, Anchorage. p. 7.    
    
    
8     Hall, J.V. 1988. Resource assessment - Alaska Region.
      National wetlands priority conservation plan. U.S.
      Department of the Interior, Fish and Wildlife service.
      Anchorage. 11 pp.
    
9     Unpublished data (1989). U.S. Dept. of Agriculture,
      Economic Research Service. Washington, D.C.
    
10    Unpublished data (1983). Dept. of Interior, U.S. Fish
      and Wildlife service, National Wetlands Inventory.
      St. Petersburg, FL.
    
11    Acreage estimate derived from source (10) in combination
      with drainage figures presented by Pavelis,
      G.A. 1987. Economic survey of farm drainage.
      In FARM DRAINAGE IN THE UNITED STATES,
      U.S. Department of Agriculture, Economic Research
      Service, Washington, D.C. pp. 110-136.
    
12    Hefner, J.M. and J.D. Brown. 1984. Wetland trends in the 
      southeastern United States. WETLANDS. Vol. 4, pp. 1-11.

13    California Department of Parks and Recreation. 1988.
      California Wetlands. Sacramento 38 pp.
    
14    Dennis, N.B., M.L. Marcus, and H. Hill. 1984.
      Status and trends of California wetlands. A report to
      the California Assembly Resources Subcommittee.
      125 pp.

15    Frayer, W.E., D.D. Peters and H.R. Pywell. 1989. WETLANDS OF THE 
      CALIFORNIA CENTRAL VALLEY STATUS AND TRENDS. U.S. Fish and Wildlife 
      service. Portland, OR. 28 pp.
    
16    D. Peters. Regional Wetlands Coordinator, U.S. Fish and Wildlife Service. 
      Portland, OR. Personal communication, 1990.
    
17    C. Elliott. Regional Wetlands Coordinator, U.S. Fish and Wildlife Service. 
      Denver, CO. Personal communication, 1990.
    
18    Colorado Division of Parks and Outdoor Recreation.
      1987. Statewide comprehensive outdoor recreation plan -
      wetlands amendment. Denver, CO. 13 pp.
    
19    R.W. Tiner, Regional Wetlands Coordinator, U.S. Fish and
      Wildlife service. Newton Corner, MA. Personal
      communication, 1990.
    
20    Tiner, R.W. Jr. 1985. WETLANDS OF DELAWARE. U.S. Fish
      and Wildlife service and Delaware Dept. of Natural
      Resources and Environmental Control. Newton Corner, MA
      and Dover, DE respectively. 77 pp.
    
21    Florida Department of Natural Resources. 1988. Wetlands
      in Florida. An addendum to Florida's comprehensive
      outdoor recreation plan. Division of Recreation
      and Parks. 91 pp.
    
22    Shaw, S.P. and C.G. Fredine. 1956. WETLANDS OF THE
      UNITED STATES. U.S. Department of the Interior, Fish
      and Wildlife service. Washington, D.C. Circular 39. 67 pp.
    
23    Tschinkel, V.J. 1984. Ecosystems of Surface Waters.
      In WATER RESOURCES ATLAS OF FLORIDA. E.A. Fernald and
      D.J. Patton eds. Florida Resources and Environmental
      Analysis Center, Institute of Science and Public Affairs,
      Florida State Univ. Tallahassee. 291 pp.
    
24    National Wetlands Inventory (In manuscript).
      WETLAND TRENDS IN FLORIDA. U.S. Fish and Wildlife
      Service, St. Petersburg, FL.
    
25    Kundell, J.E. and S.W. Woolf. 1986. GEORGIA WETLANDS
      TRENDS AND POLICY OPTIONS. Carl Vinson Institute
      of Government, Univ. of Georgia. Athens. 112 pp.
    
26    A. Yuen. Biologist, U.S. Fish and Wildlife Service.
      Honolulu, HI. Personal communication, 1990.
    
27    Illinois Department of Conservation. 1988. A FIELD GUIDE
      TO THE WETLANDS OF ILLINOIS. Springfield, IL. 244 pp.
    
28    M. Hubbell. Illinois Department of Conservation, Division
      of Planning and Information. Springfield, IL.
      Personal communication, 1990.

29    Indiana Department of Natural Resources. 1988.
      WETLANDS - INDIANA'S ENDANGERED NATURAL
      RESOURCE. Division of Outdoor Recreation. 19 pp.

30    D. Hudak. Field Supervisor, U.S. Fish and Wildlife Service.
      Bloomington, IN. Personal communication (based on
      National Wetlands Inventory map data for IN), 1990.

31    R.A. Bishop. Wildlife Bureau, Iowa Department of Natural
      Resources. Des Moines, IA. Personal communication.
      1990.

32    Iowa Natural Heritage Foundation. 1988. Iowa's Prairie
      Pothole Joint Venture. Iowa Natural Heritage. Fall, 1988.
      p. 24.

33    Bishop, R.A. 1981. Iowa's Wetlands. PROC. IOWA ACAD. SCI.
      88(1): 11-16.
    
34    Kentucky Soil and Water Conservation Commission.
      1982. KENTUCKY SOIL AND WATER CONSERVATION
      PROGRAM. Part 1. Overview and appraisal of soil and
      water resources. Division of Conservation, KY Natural
      Resources and Environmental Protection Cabinet,
      Frankfort, KY.
    
35    Kentucky Department of Local Government. 1987.
      Wetlands. An addendum to the 1984 assessment and
      policy plan for outdoor recreation. Commonwealth of KY.
      57 pp.
    
36    National Wetlands Inventory. (In draft) WETLAND
      TRENDS IN THE SOUTHEASTERN UNITED STATES.
      U.S. Fish and Wildlife Service. Atlanta, GA.
    
37    Tiner, R.W. Jr. and P.L.M. Veneman. 1987. HYDRIC SOILS
      OF NEW ENGLAND. University of Massachusetts
      Cooperative Extension. Amherst, MA. 27 pp.
    
38    Widoff, Lissa. 1988. MAINE WETLANDS CONSERVATION
      PRIORITY PLAN. Maine Bureau of Parks and Recreation,
      Maine State Planning Office and Wetlands Subcommittee,
      Land and Water Resources Council. 91 pp.
    
39    Tiner, R.W. Jr. and J.T. Finn. 1986. STATUS AND RECENT
      TRENDS OF WETLANDS IN FIVE MID-ATLANTIC STATES.
      U.S. Fish and Wildlife Service and U.S. Environmental
      Protection Agency. Newton Corner, MA and Philadelphia,
      PA respectively. 40 pp.
     
40    Michigan Department of Natural Resources. 1988.
      Michigan's 1987-88 Recreation Action Program.
      Recreation Division. E. Lansing, MI. 72 pp.
    
41    University of Minnesota. 1981. Thematic Map: Available
      wetlands for Bioenergy purposes. Center for Urban and
      Regional Affairs. St. Paul, MN.

42    Acreage derived by combining existing wetland acreage
      (source 9) with drainage data presented by Pavelis, G.A.
      1987. Economic survey of farm drainage. In FARM
      DRAINAGE IN THE UNITED STATES. U.S.D.A.:, Economic
      Research Service. Washington, D.C. pp. 110-136.
    
43    Wright, J.O. 1907. SWAMP AND OVERFLOWED LANDS IN
      THE UNITED STATES. U.S. Department of Agriculture,
      Office of Experiment Stations - Circular 76. Washington, D.C.
   
44    U.S. Department of Agriculture, Soil Conservation
      Service. 1982. National resources inventory. Washington,
      D.C.
    
45    Acreage estimates made by totaling existing acreage (45)
      in combination with land in drainage (Source 9) to
      approximate original wetland acreage.
    
46    State of Nevada. 1988. Nevada's Wetlands - an element of
      recreation in Nevada, 1987 Statewide Comprehensive
      Outdoor Recreation Plan. 78 pp.
      
47    K.N. Kettenring. New Hampshire Department of
      Environmental Services, Wetlands Board. Concord, NH.
      Personal communication, 1990.
    
48    Tiner, R.W.,Jr. 1985. WETLANDS OF NEW JERSEY
      U.S. Fish and Wildlife Service. Newton Corner, MA 117 pp.
    
49    New York State Office of Parks, Recreation and Historic
      Preservation. 1988. Wetlands Protection in New York
      State. 15 pp.
    
50    Soil Conservation Service. Unpublished data. Acreage of
      wet soils (drained and undrained) for North Dakota.
      Assembled for the N.D. sensitive wildlife species and
      habitat workshop. 1981.
    
51    Dahl, T.E. (In manuscript). STATUS OF PRAIRIE POTHOLE
      WETLANDS IN THE UNITED STATES. U.S. Fish and
      Wildlife Service, National Wetlands Inventory.
      St. Petersburg, FL.
    
52    K. Baker. Ohio Department of Natural Resources,
      Division of Water. Columbus, OH. Personal
      communication. 1990.
    
53    Brabander, J.J., R.E. Master, and R.M. Short. 1985.
      BOTTOMLAND HARDWOODS OF EASTERN OKLAHOMA.
      USDI, Fish and Wildlife Service and Oklahoma Dept.
      Wildlife Conservation. 147 pp.
    
54    Stinnett, D.P., R.W. Smith, and S.W. Conrady. 1987.
      RIPARIAN AREAS OF WESTERN OKLAHOMA. USDI,
      Fish and Wildlife Service and Oklahoma Dept. Wildlife
      Conservation. 79 pp.
    
55    Oklahoma Tourism and Recreation Department. 1987.
      Oklahoma statewide comprehensive outdoor recreation
      plan. 184 pp.
    
56    Pennsylvania Department of Environmental Resources
      and Pennsylvania Department of Community Affairs.
      1988. Pennsylvania's recreation plan 1986-1990 Wetlands
      addendum. 48 pp.
    
57    Adapted from Rector, D.D. 1981. SOIL SURVEY OF RHODE
      ISLAND. U.S.D.A. Soil Conservation Service, West Warwick,
      RI. 200 pp.
    
58    Tiner, R.W. Jr. 1989. WETLANDS OF RHODE ISLAND. U.S.
      Fish and Wildlife Service. Newton Corner, MA. 71 pp.
     
59    Soil Conservation Service. Unpublished data. Hydric soil
      acreages by county for the State of South Dakota. 1988.
    
60    Frye, R.G. 1987. Bottomland hardwoods - current supply,
      status, habitat quality and future impacts from reservoirs.
      In INTERAGENCY WORKSHOP ON THE STATUS AND
      ECOLOGY OF BOTTOMLAND HARDWOODS IN TEXAS.
      Texas Parks Wildlife Dept., Austin, TX.
    
61    Texas Parks and Wildlife Department. 1988. The Texas
      Wetlands plan - addendum to the 1985 Texas outdoor
      recreation plan. 35 pp.
    
62    Original wetland estimates based on existing acreage plus
      land in agricultural drainage as indicated by (9).
    
63    Jensen, Clair F. 1974. EVALUATION OF EXISTING WETLAND
      HABITAT IN UTAH. Utah Dept. of Natural Resources,
      Division of Wildlife Resources. Pub. No. 74-17.
    
64    Utah Division of Parks and Recreation and Utah
      Department of Natural Resources. 1988. UTAH'S
      WETLANDS AN IMPORTANT OUTDOOR RECREATION
      RESOURCE. 41 pp.
    
65    Parsons, J. 1989. 1988 VERMONT RECREATION PLAN -
      WETLANDS COMPONENT. Vermont Department of Forests,
      Parks and Recreation. 43 pp.
    
66    Commonwealth of Virginia. 1988. THE VIRGINIA
      OUTDOORS PLAN - WETLANDS. Virginia Department of
      Conservation and Recreation, Division of Planning and
      Recreational Resources. pp. 156-168.
    
67    Peters, D.D. 1990. WETLANDS AND DEEP WATER HABITATS
      IN THE STATE OF WASHINGTON. U.S. Fish and Wildlife
      Service, National Wetlands Inventory. Portland, OR 8 pp.
    
68    West Virginia Department of Natural Resources. 1988.
      WEST VIRGINIA WETLANDS CONSERVATION PLAN. Wildlife
      Resources Division. pp. c/2-c/22.
    
69    Johnson, C.D. 1976. WETLAND USE IN WISCONSIN:
      HISTORICAL PERSPECTIVE AND PRESENT PICTURE.
      Wisconsin Department of Natural Resources. Madison,
      WI. 48 pp.
    
70    Wisconsin Department of Natural Resources. No date. 
      Wisconsin Wetlands Priority Plan - an addendum to: 
      Wisconsin's 1986-91 statewide comprehensive outdoor 
      recreation plan. 22 pp.
    
71    Wyoming Game and Fish Department. 1987. Wetlands Component -
      1985 Wyoming state comprehensive outdoor recreation plan. 30 pp.
    
72    Frayer, W.E., T.J. Monahan, D.C. Bowden, and F.A. Graybill. 1983.
      STATUS AND TRENDS OF WETLANDS AND DEEPWATER HABITATS IN THE 
      CONTERMINOUS UNITED STATES, 1950'5 TO 1970'5. Colorado State 
      University, Ft. Collins. 31 pp.
    
73    Roe, H.B. and Q.C. Ayres. 1954. ENGINEERING FOR
      AGRICULTURAL DRAINAGE. McGraw-Hill Book Co., New
      York. 501 pp.
    
74    Office of Technology Assessment. 1984. WETLANDS:
      THEIR USE AND REGULATION. OTA-0-206 U.S. Congress.
      Washington, D.C. 208 pp.
    
75    Tiner, R.W. Jr. 1984. WETLANDS OF THE UNITED STATES:
      CURRENT STATUS AND RECENT TRENDS. U.S. Fish and
      Wildlife Service, National Wetlands Inventory.
      Washington, D.C. 59 pp.
    
76    Feierabend, J.S. and J.M. Zelazny. 1987. STATUS REPORT
      ON OUR NATION'S WETLANDS. National Wildlife
      Federation. Washington, D.C. 46 pp.
    
77    Federal Interagency Committee for Wetland Delineation.
      1989. FEDERAL MANUAL FOR IDENTIFYING AND
      DELINEATING JURISDICTIONAL WETLANDS. U.S. Army
      Corps of Engineers, U.S. Environmental Protection Agency,
      U.S. Fish and Wildlife Service, and U.S.D.A. Soil
      Conservation Service, Washington, D.C. Cooperative
      technical publication. 76 pp.
    
78    U.S. Department of Agriculture, Soil Survey Staff. 1975.
      SOIL TAXONOMY: A BASIC SYSTEM OF SOIL CLASSIFICATION
      FOR MAKING AND INTERPRETING SOIL SURVEYS.
      U.S. Dept of Agriculture, Soil Conservation Service,
      Washington, D.C. 754 pp.
    
79    U.S. Department of Agriculture, Economic Research
      Service. (unpublished) Wetland Priority Analysis -
      lower 48 states. (1989). Washington, D.C.
    
80    U.S. Department of Agriculture and Iowa State
      University Statistical Laboratory. 1984 National
      Resources Inventory -A guide for users of 1982 NRI
      data files. Washington, D.C.
     
81    U.S. Department of Agriculture, Economic Research
      Service (G A. Pavelis ea.) 1987. FARM DRAINAGE IN THE
      UNITED STATES: HISTORY, STATUS, AND PROSPECTS.
      Miscellaneous Publication No. 1455. Washington, D.C.
      170 pp.