TY  - RPRT
TI  - Preliminary map showing construction materials in the south one-half of Williams County, North Dakota
AU  - Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey
PY  - 1947
DO  - 10.3133/ofr4722
UR  - https://pubs.usgs.gov/publication/ofr4722
ID  - ofr4722
ER  -