TY  - RPRT
TI  - Registers of 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  - 1949
DO  - 10.3133/1490
UR  - https://pubs.usgs.gov/publication/1490
ID  - 1490
ER  -