4 books
Aquatic and Wetland Plants of Northeastern North America, Volume I
Aquatic and Wetland Plants of Northeastern North America, Volume II
Aquatic and Wetland Plants of Northeastern North America, Volume II: A Revised and Enlarged Edition of Norman C. Fassett's a Manual of Aquatic Plants, Volume II Angiosperms Monocotyledons
Aquatic and Wetland Plants of Northeastern North America, Volume I: A Revised and Enlarged Edition of Norman C. Fassett's a Manual of Aquatic Plants, Volume I Pteridophytes, Gymnosperms, and Angiosperms Dicotyledons