TY  - RPRT
TI  - A 125 year history of topographic mapping and GIS in the U.S. Geological Survey 1884-2009, part 1: 1884-1980
AU  - E. Lynn Usery
AU  - Dalia Varanka
AU  - Michael P. Finn
PY  - 2009
UR  - https://pubs.usgs.gov/publication/70038929
ID  - 70038929
ER  -