Carlquist, Sherwin John, 1930-2021. [Erysimum close-up on Tenerife Island, Canary Islands], photograph, April 17, 1967; (https://texashistory.unt.edu/ark:/67531/metapth1645880/m1/1/: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .