TY  - RPRT
TI  - Instructions to rain-fall observers of U.S. Geological Survey
AU  - Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey
PY  - 1889
DO  - 10.3133/70046399
UR  - https://pubs.usgs.gov/publication/70046399
ID  - 70046399
ER  -