Maps showing platinum-group-element occurrences in the conterminous United States, updated as of 1993 / U.S. Department of the Interior, U.S. Geological Survey ; by Jocelyn A. Peterson
Series Titles:
Miscellaneous field studies ; map MF-2270 Miscellaneous field studies ; map MF-2270.
Variant Titles:
Platinum group element occurrences in the conterminous United States, updated as of 1993