Mule production.

26 FARMERS' BULLETIN 1341
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Figure 19.-A Good cotton mule.
Figure 20.-A Medium cotton mule.

Williams, J. O. (John Oscar), 1885- & Speelman, S. R. (Sanford Reed), 1894-. Mule production.. Washington, D.C.. UNT Digital Library. http://digital.library.unt.edu/ark:/67531/metadc1784/. Accessed March 1, 2015.