McClung, Richard L.Improvement in Cotton Scrapers, Choppers, and Cultivators.,
patent,
November 2, 1875;
[Washington D.C.].
(https://texashistory.unt.edu/ark:/67531/metapth166491/m1/1/:
accessed July 18, 2024),
University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.;
crediting UNT Libraries Government Documents Department.