Understanding our fragile environment : lessons from geochemical studies /
Gough, L. P.
Asher-Bolinder, Sigrid.
Bales, Carole A.
Runberg, Sonja K.
Wells, Robert K.
[Washington, D.C.] : U.S. G.P.O. ; Denver, CO : USGS Map Distribution,
1993.
Includes bibliographical references (p. 31).
Environmental geochemistry.