Public domain
Washington, D.C. John Zydik, an employee of the U.S. Geological Survey, Alaska branch, using the double-photo-alidade to make a topographic map
From the collection of Library of Congress. Free to download, adapt and use — no permission needed.
Credit lineWashington, D.C. John Zydik, an employee of the U.S. Geological Survey, Alaska branch, using the double-photo-alidade to make a topographic map. 1943-01-01. Rosener, Ann. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.
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