TY  - RPRT
TI  - Structure-contour map of the Montana plains
AU  - C. E. Dobbin
AU  - C. E. Erdmann
PY  - 1946
DO  - 10.3133/ofr4633
UR  - https://pubs.usgs.gov/publication/ofr4633
ID  - ofr4633
ER  -