TY  - RPRT
TI  - Occurrence and morphology of carbonate concretions in the Beulah-Zap coal bed, Williston basin, North Dakota
AU  - C.W.M. Keighin
AU  - R. M. Flores
AU  - T. Rowland
PY  - 1996
DO  - 10.1016/0146-6380(96)00020-4
UR  - https://pubs.usgs.gov/publication/70019328
ID  - 70019328
ER  -