TY  - RPRT
TI  - Mineral resources of Alaska, report on progress of investigations in 1917--Sulphur on Unalaska and Akun islands and near Stepovak Bay
AU  - A.G. Maddren
PY  - 1919
DO  - 10.3133/b692e
UR  - https://pubs.usgs.gov/publication/b692E
ID  - b692E
ER  -