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 Serial/Series Title: U.S. Bureau of Plant Industry. [Soil survey report] series 1934, no. 21
 Collection: Texas Soil Surveys
Soil survey, Zavala County, Texas
Text describes the area, climate, agricultural history and statistics, soil-survey methods and definitions, soils and crops, land uses and agricultural methods, irrigation, and morphology and genesis of soils of Zavala County, Texas. texashistory.unt.edu/ark:/67531/metapth19818/