Understanding our fragile environment : lessons from geochemical studies / compiled by Larry P. Gough ; with contributions from Sigrid Asher-Bolinder ... [et al.] ; edited by Carole A. Bales, Sonja K. Runberg, and Robert K. Wells.
Imprint
[Washington, D.C.] : U.S. G.P.O. ; Denver, CO : USGS Map Distribution, 1993.