Books by Roy O. Billett:
Books in the extended shelves:
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Billett, Roy O. (Roy Oren), 1891-: Administration and supervision : in two parts (U.S. G.P.O., 1933), also by Fred Engelhardt, Carl A. Jessen, Leonard V. Koos, William John Cooper, William H. Zeigel, and United States Office of Education (page images at HathiTrust)
Find more by Roy O. Billett at your library, or elsewhere.