TY  - RPRT
TI  - Contributions to economic geology (short papers and preliminary reports), 1923-1924, Part I, Metals and nonmetals except fuels. Observations on the rich silver ores of Aspen Colorado
AU  - E.S. Bastin
PY  - 1925
DO  - 10.3133/b750c
UR  - https://pubs.usgs.gov/publication/b750C
ID  - b750C
ER  -