TY  - RPRT
TI  - Bibliography for update and revision of U.S.G.S. Bulletin 1114, Minerals of Colorado -- a 100 year record, by Edwin B. Eckel, Part D - Disk (Wordstar; 1.44 mb, 3 1/2 in.)
AU  - Donley S. Collins
AU  - Robert R. Cobban
AU  - Eugene E. Foord
AU  - Jack A. Murphy
PY  - 1989
DO  - 10.3133/ofr89206d
UR  - https://pubs.usgs.gov/publication/ofr89206D
ID  - ofr89206D
ER  -