"Freshwater algae Identification." . . "Alghe - Classificazione." . . "Zoetwater-flora." . . "Algae" . . "Algae." . . "How to know the fresh-water algae; an illustrated key for identifying the more common fresh-water algae to genus, with h" . "How to know the fresh-water algae : an illustrated key for identifying the more common fresh-water algae to genus, with hundreds of species named pictured and with numerous aids for their study" . . . . "How to know the freshwater algae. : = The freshwater algae" . . . . . . . . . . "How to know the fresh-water Algae" . . . . . "How to know the freshwater algae : An ill. guide for identifying the more common freshwater algae to genus .̤" . "How to know the fresh-water algae an illustrated key for identifying the more common fresh-water algae to genus, with hundreds of species named pictured and with numerous aids for their study"@en . . . . . . . . . "How to know the fresh-water algae; an illustrated key for identifying the more common fresh-water algae to genus, with hundreds of species named pictured and with numerous aids for their study" . "How to know the fresh-water algae ; an illustrated key for identifying the more common fresh-water algae to genus"@en . . "A guide to identifying various types of freshwater algae." . . . . . "How to know the freshwater Algae"@en . "How to know the fresh-water algae: an illustrated key for identifying the more common fresh-water algae to genus, with hundreds of species named and pictured and with numerous aids for their study"@en . "How to know the fresh-water algae; an illustrated key for identifying the more common fresh-water algae to genus, with hundreds of species named and pictured and with numerous aids for their study" . . "How to know the fresh-water algae; an illustrated key for identifying the more common fresh-water algae to genus, with hundreds of species named and pictured and with numerous aids for their study"@en . "How to Know the Freshwater Algae" . . . . . . . . . . "Freshwater algae" . . . . . . . . . "How to know the fresh-water algae : an illustrated key for identifying the more common fresh-water algae to genus, with hundreds of species named and pictured and with numerous aids for their study" . . . . "How to know the fresh-water algae : an illustrated key for identifyng the more common fresh-water algae to genus" . . . . . . "How to know freshwater Algae"@en . . "Guidebooks"@en . "Guidebooks" . . . . "How to know the fresh-water algae : an illustrated key for identifying the more common fresh-water algae to genus, with h"@en . . . . . . . . . "How to know the freshwater algae : an illustrated key for identifying the more common fresh-water algae to genus, with hundreds of species named and pictured and with numerous aids for their study" . . . . . . . . "How to know the fresh-water algae an illus.key for identifying the more common fresh-water algae to genus, with hundreds of species named and pictured and with numerous aids for their study" . "How to know the fresh-water algae"@en . "How to know the fresh-water algae" . "How to know the fresh-water algae, an illustrated key for identifying the more common fresh-water algae to genus"@en . . . "How to know the fresh-water algae : an illustrated key for identifying the more common fresh-water algae to genus ; with hundreds of species named and pictured and with numerous aids for their study"@en . . . . . . . . "How to know the freshwater algae"@en . "How to know the freshwater algae" . . "Algen." . . "Algues." . . "Milieu." . . "Flora." . . "Algas de agua dulce Identificación." . . "Freshwater algae." . . "Eau douce." . . "Bestemmelsesværk" . . . . "Limnologie." . . "Freshwater plants." . . "Algues Classification." . . "Algas." . . "Systematische plantkunde." . . "Flore d'eau douce." . . "Algues d'eau douce Identification." . .