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The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Salinas, California. Intercontinental Rubber Producers. Dr. William B. McCallum, manager who had been with the company since 1910 and is reputed to be the world's outstanding expert in guayule culture" The New York Public Library Digital Collections. 1941. https://digitalcollections.nypl.org/items/11114680-9523-0137-18cf-3585a3f9e73d
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Salinas, California. Intercontinental Rubber Producers. Dr. William B. McCallum, manager who had been with the company since 1910 and is reputed to be the world's outstanding expert in guayule culture" New York Public Library Digital Collections. Accessed March 28, 2024. https://digitalcollections.nypl.org/items/11114680-9523-0137-18cf-3585a3f9e73d
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. (1941). Salinas, California. Intercontinental Rubber Producers. Dr. William B. McCallum, manager who had been with the company since 1910 and is reputed to be the world's outstanding expert in guayule culture Retrieved from https://digitalcollections.nypl.org/items/11114680-9523-0137-18cf-3585a3f9e73d
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/11114680-9523-0137-18cf-3585a3f9e73d | title=
(still image)
Salinas, California. Intercontinental Rubber Producers. Dr. William B. McCallum, manager who had been with the company since 1910 and is reputed to be the world's outstanding expert in guayule culture, (1941)|author=Digital Collections, The New York Public Library |accessdate=March 28, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>