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 November 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .