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by Hitchcock, David; Kümin, Beat; Cowan, Brian
by Hitchcock, David
by Hitchcock, David Ingersoll
by Blair, Alasdair; Hitchcock, David
by Sherrill, Charles Hitchcock; Hill, David Jayne (CON)
by Hitchcock, C. Leo; Cronquist, Arthur; Giblin, David E.; et al.
by David Hitchcock
by David Hitchcock; Julia McClure