Public domain
Professor Peterson of the Soils and Agronomy Department with apparatus for making counts of aggregates in a study of 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 lineProfessor Peterson of the Soils and Agronomy Department with apparatus for making counts of aggregates in a study of soil structure. On the ruled paper on the right appears an image of soil particles . 1942-01-01. Delano, Jack. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.
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