International Boundary & Water Commission, United States & Mexico. Report of the Boundary Commission Upon the Survey and Re-Marking of the Boundary Between the United States and Mexico West of the Rio Grande, 1891-1896. Album, book, 1899; (https://digital.library.unt.edu/ark:/67531/metadc1030/m1/11/: accessed October 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .