Chemogram, January 1997, periodical, 1997; (https://texashistory.unt.edu/ark:/67531/metapth1624005/m1/4/: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Chemogram, January 1997, periodical, 1997; (https://texashistory.unt.edu/ark:/67531/metapth1624005/m1/4/: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .