Carlquist, Sherwin John, 1930-2021. [Cneorum close-up in Arguineguin, Canary Islands], photograph, May 12, 1967; (https://texashistory.unt.edu/ark:/67531/metapth1646003/m1/1/: accessed June 23, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .