TY  - RPRT
TI  - Table of differences of altitude to nearest foot for angles from 1 minute to 2 degrees and for distances under 1 mile
AU  - Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey
PY  - 1891
DO  - 10.3133/70047701
UR  - https://pubs.usgs.gov/publication/70047701
ID  - 70047701
ER  -