TY  - RPRT
TI  - Geologic and structure contour maps of the northern and western flanks of the Black Hills, Wyoming, Montana, and South Dakota
AU  - W. J. Mapel
AU  - Charles Sherwood Robinson
PY  - 1956
DO  - 10.3133/ofr5677
UR  - https://pubs.usgs.gov/publication/ofr5677
ID  - ofr5677
ER  -