Dr. William B. McCallum with Guayule Plants 1941
Dr. William B. McCallum stands with guayule plants in Salinas, California, in December 1941. He managed the International Rubber Company of California, focusing on guayule cultivation. This plant was explored as an alternative rubber source during World War II, reflecting wartime agricultural strategies in the U.S.
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Dr. William B. McCallum with Guayule Plants 1941
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