TY  - RPRT
TI  - Aeromagnetic maps and second vertical derivative maps of Great Sitkin Island, Northern Adak Island, and part of northeastern Umnak Island, Alaska
AU  - Isidore Zietz
AU  - Roland G. Henderson
PY  - 1949
DO  - 10.3133/ofr499
UR  - https://pubs.usgs.gov/publication/ofr499
ID  - ofr499
ER  -