TY  - RPRT
TI  - Digital grade and tonnage data for 50 types of mineral deposits; Macintosh version
AU  - Donald A. Singer
AU  - Dan L. Mosier
AU  - David W. Menzie
PY  - 1993
DO  - 10.3133/ofr93280
UR  - https://pubs.usgs.gov/publication/ofr93280
ID  - ofr93280
ER  -