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by Eric Connally (Harvard University Extension); Deborah Hughes-Hallett (The University of Arizona); Andrew M. Gleason (Harvard Univ.); et al.
by John R. Schermerhorn (Ohio University)
by Dominick Salvatore (Fordham University)
by Alan F. Arbogast (Michigan State University )
by R. Kelly Rainer (Auburn Univ.); Casey G. Cegielski (Auburn University)
by Young, Hugh D.; Freedman, Roger A.
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by Greg L. Stewart (University of Iowa); Kenneth G. Brown (University of Iowa )
by H. J. de Blij (Michigan State University); Peter O. Muller (University of Miami); Jan Nijman (University of Miami); et al.
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