BUREAU OF MINES
A. SUMAN PUMPING JACK, SARATOGA, TEX.
B. UNIT PUMPING POWER, BARTLESVILLE, OKLA.
C. GEARED POWER, COALINGA OIL FIELD, CALIFORNIA
BULLETIN 224 PLATE XIII
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George, H. C.. Surface Machinery and Methods for Oil-Well Pumping. Washington D.C.. UNT Digital Library. http://digital.library.unt.edu/ark:/67531/metadc12407/. Accessed May 21, 2013.
