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المؤلفون: Bert Boyd, F.J. Shaddock, J. Herbert Hood, L.R. Walston, Dwight R. Wilson, F.F. Drew, Frank J. Bell, R.P. Taylor, J.H. Baldwin, H.C. McKittrick, Albert L. Midgley, W.E. Williams, M.R. Chapin, E.S. Smith, H.H. Antles, M.J. Goode, William Kettler, C.A. Herrick
المصدر: The Journal of the National Dental Association. 8:335-340