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Relative nitrogen availability along a disturbance gradient in headwater wetlands in the Upper Juniata watershed, PennsylvaniaWilliams-Tober, Michelle R. Smithwick, Erica, January 2009 (has links)
Thesis (M.S.)--Pennsylvania State University, 2009. / Mode of access: World Wide Web. Thesis advisor: Erica A.H. Smithwick.
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