TY  - RPRT
TI  - Colorado vermiculite deposits: mines, prospects, and occurrences
AU  - Bradley S. VanGosen
AU  - Alfred L. Bush
PY  - 2001
DO  - 10.3133/ofr01475
UR  - https://pubs.usgs.gov/publication/ofr01475
ID  - ofr01475
ER  -