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1. BAKER, 0. E.
        1937. A graphic summary of physical features and
        land utilization in the United States. U. S.
        Department of Agriculture, Miscellaneous Publication 260.

2. BALDWIN, MARK, CHARLES E. KELLOGG, and JANE THORP
        1938. Soil classification. In Soils and men, U. S.
        Department of Agriculture, Yearbook 1938.
    
3. BOURN, WARREN S., and CLARENCE COTTAM
        1950. Some biological effects of ditching tidewater 
        marshes. U. S. Department of Interior, Fish and
        Wildlife Service, Research Report 19.
    
4. COTTAM, CLARENCE, and WARREN S. BOURN
        1952. Coastal marshes adversely affected by drainage. 
        Transactions, 17th North American Wildlife
        Conference.
    
5. GRAY, L. C., and others 
        1923. The utilization of our lands for crops, pasture,
        and forests. U. S. Department of Agriculture,
        Yearbook 1923.

6. HIBBARD, BENJAMIN H. 
        1939. A history of land policies. Peter Smith,
        New York, N. Y.
    
7. KENNEY, F. R., and W. L. McATEE 
        1938. The Problem: Drained areas and wildlife 
        habitats. In Soils and men, U. S. Department of
        Agriculture, Yearbook 1938.
    
8. LINCOLN, FREDERICK C. 
        1950. Migration of birds. U. S. Department of
        Interior, Fish and Wildlife Service, Circular 16.

9. MARTIN, ALEXANDER C., NEIL HOTCHKISS, FRANCIS 
        M. UHLER, and WARREN S. BOURN
        1953. Classification of wetlands of the United
        States. U. S. Department of the Interior, Fish
        and Wildlife Service, Special Scientific Report--
        Wildlife No. 20.

10. MILLER, GEORGE F.
        1950. Reclamation of wet and overflow lands. In
        Conservation of Natural Resources. John Wiley
        & Sons, New York, N. Y.
    
11. SOIL SURVEY DIVISION
        1938. Soils of the United States. In Soils and men,
        U. S. Department of Agriculture, Yearbook 1938.
    
12. SOIL SURVEY STAFF 
        1951. Soil survey manual. U. S. Department of
        Agriculture, Handbook No. 18.
    
13. U. S. BUREAU OF THE CENSUS 
        1950. Drainage of agricultural lands. United
        States Census of Agriculture, vol. 4.
    
14. WOLFANGER, L. A. 
        1950. The great soil groups and their utilizations.
        In Conservation of natural resources. John
        Wiley & Sons, New York, N. Y.
    
15. WOOTEN, H. H. 
        1953. Major uses of land in the United States.
        U. S. Department of Agriculture, Technical
        Bulletin 1082.
    
16. WOOTEN, H. H., and MARGARET R. PURCELL 
        1949. Farm land development: present and future
        by clearing, drainage, and irrigation. U. S.
        Department of Agriculture, Circular 825.
    
17. WRIGHT, J. 0. 
        1907. Swamp and overflowed lands in the United
        States. U. S. Department of Agriculture, Circular 76.
    
18. YEAGER, LEE E. 
        1954. Wetland is fur country. National Wildlife
        Federation, Washington, D. C.