Public domain
Chicago, Illinois. Apparatus for determining components of the various alloys used on railroads at the testing laboratory of the Chicago and Northwestern Railroad
From the collection of Library of Congress. Free to download, adapt and use — no permission needed.
Credit lineChicago, Illinois. Apparatus for determining components of the various alloys used on railroads at the testing laboratory of the Chicago and Northwestern Railroad. 1942-01-01. Delano, Jack. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.
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