TY  - RPRT
TI  - PACER; data entry, retrieval, and update for the National Coal Resources Data System (Phase I)
AU  - Simon M. Cargill
AU  - A.C. Olson
AU  - A.L. Medlin
AU  - M.D. Carter
PY  - 1976
DO  - 10.3133/pp978
UR  - https://pubs.usgs.gov/publication/pp978
ID  - pp978
ER  -