TY  - RPRT
TI  - Letters received by the United States Geological Survey, 1879-1901
AU  - Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey
PY  - 1964
DO  - 10.3133/1479
UR  - https://pubs.usgs.gov/publication/1479
ID  - 1479
ER  -