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by Hughes, Robert
by Pride, William M.; Hughes, Robert J.; Kapoor, Jack R.
by Hughes, Meirion; Stradling, Robert
by Hughes, Robert C.
by Kapoor, Jack R.; Dlabay, Les R.; Hughes, Robert J.; et al.
by John S. Hughes (Univ. of California, Los Angeles); Frances L. Ayres (Univ. of Oklahoma ); Robert E. Hoskin (Univ. of Connecticut)
by Carr, Deborah, Ph.D.; Crosnoe, Robert; Hughes, Mary Elizabeth; et al.
by Hughes, Robert William