TY  - RPRT
TI  - The 20th-Century Topographic Survey as Source Data for Long-Term Landscape Studies at Local and Regional Scales
AU  - Dalia Varanka
PY  - 2006
DO  - 10.3133/ofr20061002
UR  - https://pubs.usgs.gov/publication/ofr20061002
ID  - ofr20061002
ER  -