TY  - RPRT
TI  - Mineral resources of Alaska, report on progress of investigations in 1931. Reconnaissance of the northern Koyukuk Valley, Alaska
AU  - Robert Marshall
PY  - 1934
DO  - 10.3133/b844e
UR  - https://pubs.usgs.gov/publication/b844E
ID  - b844E
ER  -