Wetlands, status and trends in the conterminous United States, mid-1970's to mid-1980's : first update of the national wetlands status report - Dahl, Thomas E.; Johnson, Craig E.; Frayer, W. E.; U.S. Fish and Wildlife Service (Washington, D.C. : U.S. Dept. of the Interior, Fish and Wildlife Service : For sale by the U.S. G.P.O., Supt. of Docs., 1991)
Includes bibliographical references (p. 16)
Keywords: Wetlands -- United States; Wetland conservation -- United States