University of Pennsylvania collection of Carl Zigrosser correspondence, JM012, Box: JM Multi Small 1, Folder: 5. University of Northern Colorado.
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University of Pennsylvania collection of Carl Zigrosser correspondence, JM012, Box: JM Multi Small 1, Folder: 5. University of Northern Colorado. https://uncoarchives.coalliance.org/repositories/2/resources/250 Accessed February 06, 2026.
