90 Years and 535 Miles: Vegetation Changes Along the Mexican Border by Robert R. Humphrey
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1987 University of New Mexico Press hard cover with dust jacket and 448 pages. Between 1892 and 1894, 258 monuments were erected and photographed along the Mexican border between El Paso and the Pacific Ocean. Their original purpose was to serve as unalterable evidence in the boundary and rights-of-access disputes between the United States and Mexico. By comparing these photographs with photographs made years later, the author has been able to determine the kinds and amount of vegetative changes over time. Mexican-American Border; Phytogreography; Botany; Plant Ecology