Mule production.

MULE PRODUCTION 27
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Figure 21.-A team of Choice surface mining mules.
Figure 22.~Ale.
Figure 22.-A Choice surface mining 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 September 2, 2014.