Dallas County (Tex.). Dallas County Probate Case 2923: Cern, Isaac (Deceased), legal document, 1906-03-13/1907-11-13; (https://texashistory.unt.edu/ark:/67531/metapth575601/m1/1/: accessed July 17, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .