TY  - RPRT
TI  - Preliminary data on some Precambrian deposits of zinc-copper-lead sulfides and zinc spinel (granite) in Colorado
AU  - Douglas M. Sheridan
AU  - William H. Raymond
PY  - 1977
DO  - 10.3133/ofr77607
UR  - https://pubs.usgs.gov/publication/ofr77607
ID  - ofr77607
ER  -