Britton, Joseph; Britton, Michael; Britton, David & La Grove, M. Toxolasma texasense, Specimen #1187, specimen, August 27, 1979; (https://digital.library.unt.edu/ark:/67531/metadc35377/m1/1/: accessed December 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .