TY  - RPRT
TI  - Stratigraphic sequence form manual: guide for entering stratigraphic data into the National Coal Resource Data System (NCRDS)
AU  - M. Devereux Carter
AU  - A.L. Medlin
AU  - M.A. Carey
AU  - K.K. Krohn
PY  - 1981
DO  - 10.3133/ofr81562
UR  - https://pubs.usgs.gov/publication/ofr81562
ID  - ofr81562
ER  -