TY  - RPRT
TI  - Specification for the U.S. Geological Survey Historical Topographic Map Collection
AU  - Gregory J. Allord
AU  - Jennifer L. Walter
AU  - Kristin A. Fishburn
AU  - Gale A. Shea
PY  - 2014
DO  - 10.3133/tm11b6
UR  - https://pubs.usgs.gov/publication/tm11B6
ID  - tm11B6
ER  -