Steven G. Whisenant, « Common Rangeland Plants of West Central Texas by George Clendenin, USDA–Natural Resources Conservation Service », Great Plains Research, vol. 28, no 2, , p. 219–219 (ISSN2334-2463, DOI10.1353/gpr.2018.0043, lire en ligne, consulté le )
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Steven G. Whisenant, « Common Rangeland Plants of West Central Texas by George Clendenin, USDA–Natural Resources Conservation Service », Great Plains Research, vol. 28, no 2, , p. 219–219 (ISSN2334-2463, DOI10.1353/gpr.2018.0043, lire en ligne, consulté le )