TY  - RPRT
TI  - Contributions to economic geology (short papers and preliminary reports, 1930 : Part I. - Metals and nonmetals except fuels
AU  - Gerald Francis Loughlin
AU  - E. F. Burchard
PY  - 1931
DO  - 10.3133/b821
UR  - https://pubs.usgs.gov/publication/b821
ID  - b821
ER  -