Cave Swallow nest, photograph, August 4, 2005; (https://texashistory.unt.edu/ark:/67531/metapth5579/m1/1/: accessed April 28, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .
Cave Swallow nest, photograph, August 4, 2005; (https://texashistory.unt.edu/ark:/67531/metapth5579/m1/1/: accessed April 28, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .