Principal gold-producing districts of the United States
Subtitle: a description of the geology, mining history, and productionof the major gold-mining districts in 21 States
By: by A. H. Koschmann and M. H. Bergendahl.
Contributors: Bergendahl, M H.
Series: Professional papers -- 610.
Publisher: United States Government Printing Office
Published: 1968
Place of publication: Washington, D.C
Language: eng