TY  - RPRT
TI  - Use of sketchmaster in compilation of geologic maps from air-photo enlargements
AU  - I. G. Sohn
PY  - 1949
DO  - 10.2113/gsecongeo.44.6.551
UR  - https://pubs.usgs.gov/publication/70215458
ID  - 70215458
ER  -