TY  - RPRT
TI  - Preliminary glacial map of North Dakota
AU  - R. B. Colton
AU  - R. W. Lemke
AU  - R. M. Lindvall
PY  - 1963
DO  - 10.3133/i331
UR  - https://pubs.usgs.gov/publication/i331
ID  - i331
ER  -