Klasse für Bodenfruchtbarkeitsuntersuchung von Süßklee an der University of Illinois, Experimentierfeld, in der Nähe von Odin, Marion County

Stereograph showing a group of men in a field listening to a lecture, from a man standing on left pointing at clover bushes, about soil fertility; several men busily writing notes.
J227033 U.S. Copyright Office.
Copyright by Keystone View Company.
No. 18410.