TY  - RPRT
TI  - Contributions to economic geology, 1912; Part I, Metals and nonmetals except fuels-Lead and Zinc
AU  - Frank Cathcart Calkins
AU  - E. L. Jones
AU  - Joseph Bertram Umpleby
PY  - 1914
DO  - 10.3133/b540e
UR  - https://pubs.usgs.gov/publication/b540E
ID  - b540E
ER  -