Spojené státy americké. Environmental Protection Agency
Pilot test of wetland condition indicators in the Prairie Pothole Region of the United States / prepared by the U.S. Geological Survey Biological Resources Division Northern Prairie Science Center Jamestown, North Dakota. -- [1st ed.]. -- [Washington D.C.] : U.S. Government Printing Office, 1997. -- xvi, 279 s. : obr., tab.
Peterson, Spencer A.. Carpenter, Lynn. Guntenspergen, Glenn R.. Cowardin, Lewis M
ekologie
504(73)