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1.
Aquatic plants of Pennsylvania a complete reference guide / by Block, Timothy A. Publication: Philadelphia : University of Pennsylvania Press, 2011 . vi, 308 p. : , "Morris Arboretum of the University of Pennsylvania." Date: 2011 Availability: No items available:

2.
Aquatic plants of Pennsylvania a complete reference guide / by Block, Timothy A. Publication: Philadelphia : University of Pennsylvania Press, 2011 . vi, 308 p. : , "Morris Arboretum of the University of Pennsylvania." Date: 2011 Availability: No items available:

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