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Courtesy of UC Berkeley, Bancroft Library
http://www.oac.cdlib.org/ark:/13030/ft8w1008nx/?order=3
Title:
A tractor disk is used to cover potatoes which had not been planted to sufficient depth. This practice is not generally necessary as adjustments were later made on the planting machines.<lb/> Photographer: Stewart, Francis<lb/> Newell, California.
Date:
1942-07-01
Contributing Institution:
UC Berkeley, Bancroft Library