TY  - RPRT
TI  - Contributions to economic geology (short papers and preliminary reports), 1912; Part I, Metals and nonmetals except fuels
AU  - Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey
PY  - 1914
DO  - 10.3133/b540
UR  - https://pubs.usgs.gov/publication/b540
ID  - b540
ER  -