Standard Operating Procedures: Extensive Variables

References

Daubenmire, R. F.  1959.  Plants and environment.  John Wiley & 
     Sons, Inc.  422 pp.

Robel, R. J., J. N. Briggs, A. D. Dayton, and L. C. Hulbert.  1970.  
     Relationships between visual obstruction measurements and weight
     of grassland vegetation.  Journal of Range Management 23:295-297.

Soil Survey Staff.  1975.  Soil taxonomy.  USDA Soil Conservation 
     Service, Agric. Handb. 436. U.S. Government Printing Office, 
     Washington, DC.

Stewart, R. E., and H. A. Kantrud.  1971.  Classification of natural 
     ponds and lakes in the glaciated prairie region.  USFWS, Research
     Publication 92.

Swanson, G. A.  1978.  A water column sampler for invertebrates in 
     shallow wetlands.  J. Wildl. Manage. 42:670-672

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