Public domain
Untitled photo, possibly related to: Washington, D.C. Dr. Philip S. Smith, chief Alaskan geologist, and Miss Hallman, engineering aid, employees of the U.S. Geological survey, Alaska branch, using an oblique sketch master. The instrument transfers the planimetry from the oblique photgraph to the bas
From the collection of Library of Congress. Free to download, adapt and use — no permission needed.
Credit lineUntitled photo, possibly related to: Washington, D.C. Dr. Philip S. Smith, chief Alaskan geologist, and Miss Hallman, engineering aid, employees of the U.S. Geological survey, Alaska branch, using an . 1943-01-01. Rosener, Ann. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.