Dr. William B. McCallum with Guayule Plant December 1941
Dr. William B. McCallum manages the International Rubber Company of California while standing beside a guayule plant in Salinas, California. In December 1941, guayule rubber was cultivated as a crucial resource for the wartime effort. This plant is known for its potential as an alternative to traditional rubber sources.
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Dr. William B. McCallum with Guayule Plant December 1941
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