TY  - RPRT
TI  - Topographic instructions of the United States Geological Survey
AU  - Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey
PY  - 1918
DO  - 10.3133/70039569
UR  - https://pubs.usgs.gov/publication/70039569
ID  - 70039569
ER  -