L. Carl Holmes (fl. c. 1910 - c. 1924) worked for the Bureau of Soils of the U.S. Department of Agriculture for many years where he oversaw soil survey work for California. He was recognized as one of the best soils specialists in the western United States. While working for the Bureau of Soils, Holmes coauthored numerous studies and helped created several soil maps of regions in California. In March 1922 Holmes became the Assistant Farm Advisor for the Agricultural Extension Service and the Citrus Growers Department of the Los Angeles County Farm Bureau.



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