TY  - RPRT
TI  - Contributions to economic geology 1906 : Part I - metals and nonmetals except fuels
AU  - Samuel Franklin Emmons
AU  - Edwin C. Eckel
PY  - 1907
DO  - 10.3133/b315
UR  - https://pubs.usgs.gov/publication/b315
ID  - b315
ER  -