Books by Ervin L. Blum:
Books in the extended shelves:
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Blum, Ervin L.: Soil survey of Kimble County, Texas (The Service, 1982), also by Texas Agricultural Experiment Station and United States. Soil Conservation Service (page images at HathiTrust)- Blum, Ervin L.: Soil survey ... Ward County, Texas (U.S. Soil Conservation Service, 1975), also by William H. Dittemore and United States. Soil Conservation Service (page images at HathiTrust)
Find more by Ervin L. Blum at your library, or elsewhere.