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by Jordan, Bradford; Ross, Prof Stephen; Jaffe, Jeffrey; et al.
by Writing Program University of Massachusetts Amherst
by Krugman; Wells
by Unknown
by Mann
by Pearlson
by James F. Manwell (University of Massachusetts, Amherst, USA); Jon G. McGowan (University of Massachusetts, Amherst, USA); Anthony L. Rogers (University of Massachusetts, Amherst, USA)
by University of Massachusetts Amherst; National Park Service