Public domain
A micro-projector set up used by Professor Peterson of Soils and Agronomy Department for making a count of aggregates in studying soil structure. On the ruled paper on the right appears an image of soil particles magnified 100 times. Iowa State College, Ames, Iowa
From the collection of Library of Congress. Free to download, adapt and use — no permission needed.
Credit lineA micro-projector set up used by Professor Peterson of Soils and Agronomy Department for making a count of aggregates in studying soil structure. On the ruled paper on the right appears an image of so. 1942-01-01. Delano, Jack. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.
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