TY  - RPRT
TI  - Geologic mapping in Alaska: U.S. Geological Survey, post-1930, scales 1:20,000 to 1:63,360
AU  - Susan B. Bartsch-Winkler
PY  - 1977
DO  - 10.3133/ofr77682
UR  - https://pubs.usgs.gov/publication/ofr77682
ID  - ofr77682
ER  -