Knisel, R., Knisel, W. Soil conservation practices and crop production in the blacklands of Texas. Washington: U.S. Gov. Print. Office, 1971 35 p. : ill.
Knisel, R., Knisel, W. Soil conservation practices and crop production in the blacklands of Texas. Washington: U.S. Gov. Print. Office, 1971 35 p. : ill.
Knisel, R., Knisel, W. (1971) Soil conservation practices and crop production in the blacklands of Texas, Washington: U.S. Gov. Print. Office 35 p. : ill.
Knisel, R., & Knisel, W. (1971). Soil conservation practices and crop production in the blacklands of Texas. Washington: U.S. Gov. Print. Office, 35 p. : ill.
Knisel R, Knisel W. Soil conservation practices and crop production in the blacklands of Texas. Washington: U.S. Gov. Print. Office; 1971. p. 35 p. : ill.
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