Nelson, J. T., and P. L. Beres. “Was It Grassland? A Look at Vegetation in Brewster County, Texas through the Eyes of a Photographer in 1899”. Texas Journal of Agriculture and Natural Resources, vol. 1, Dec. 2016, pp. 34-38, https://txjanr.agintexas.org/index.php/txjanr/article/view/330.