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by Gangel, Kenneth O., and Howard G. Hendricks, eds.
by Gangel, Kenneth O.
by Gangel, Kenneth O., and James C. Wilhoit, eds.
by Gangel, Kenneth O., and Jeffrey S. Gangel
by Kenneth O. Gangel; Warren S. Benson; Warren S. Benson
by Gangel, Kenneth O.; Benson, Warren S.