Trombley, Thomas J.
Lawrence, Kan. : U.S. Dept. of the Interior, U.S. Geological Survey ; Denver, Colo. : Information Services [distributor], 2001.
2001
Schmidt, Heather C. Ross.
Reston, Va. : U.S. Dept. of the Interior, U.S. Geological Survey ; Denver, CO : USGS Information Services [distributor], 2004.
2004