TY  - RPRT
TI  - Triangulation and primary traverse, 1916-1918. Primary traverse in Illinois and Wisconsin, 1916-1918
AU  - Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey
PY  - 1923
DO  - 10.3133/b709e
UR  - https://pubs.usgs.gov/publication/b709E
ID  - b709E
ER  -