Perry, Charles A.
Reston, Va. : U.S. Dept. of the Interior, U.S. Geological Survey ; Denver, CO : U.S. Geological Survey, Information Services [distributor], 2004.
2004
Rasmussen, Patrick P.
Lawrence, Kan. : U.S. Department of the Interior, U.S. Geological Survey ; Denver, Colo. : Information Services [distributor], 2000.
2000