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... "Livestock Numbers in Nineteenth-Century New Mexico, and the Problem of Gullying in the Southwest" Annals of the Association of American Geographers, Vol. 57, No. 4. (Dec., 1967), pp. 691-703. Stable URL: http://links.jstor.org/sici?sici=0004-5608%28196712%2957%3A4%3C691%3ALNINNM%3E2.0.CO%3B2-7 ...
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