Carlquist, Sherwin John, 1930-2021. [El Teide and rock formations from Teide National Park, Canary Islands] BRIT-A-AR003-001-05-059, photograph, 1967-04~; (https://texashistory.unt.edu/ark:/67531/metapth1646558/m1/1/: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .