TY  - RPRT
TI  - A 125 year history of topographic mapping and GIS in the U.S. Geological Survey 1884-2009, part 2: 1980-2009
AU  - E. Lynn Usery
AU  - Dalia Varanka
AU  - Michael P. Finn
PY  - 2009
UR  - https://pubs.usgs.gov/publication/70004689
ID  - 70004689
ER  -