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Dennis D. Wackerly
William Mendenhall
Dennis D. Wackerly William Mendenhall III Richard L. Schaeffer
William Mendenhall & Dennis D. Wackerly & Richard L. Scheaffer

See also:

Scheaffer, Richard L., Mendenhall III, William, Wackerly, Dennis
WAckerly, Dennis D., Mendenhall, William, Scheaffer, Richard L.