Geology of the forty-ninth parallel sheet no. 6, map 79 A. Side: 1 of 2
Reference the current side of this Map.
Geology of the forty-ninth parallel sheet no. 6, map 79 A., map, 1913; [Ottawa, Ontario, Canada]. (https://texashistory.unt.edu/ark:/67531/metapth187400/m1/1/?rotate=270: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting University of Texas at Arlington Library.