Wetlands, status and trends in the conterminous United States, mid-1970's to mid-1980's : first update of the national wetlands status report / by Thomas E. Dahl and Craig E. Johnson ; statistical data analysis by W.E. Frayer.
Imprint
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.