books.google.it - The second revised edition of this manual aims at providing students and less experienced professional aquatic biologists with a key to identify some to the more commonly encountered aquatic freshwater algal genera of the United States. In response to reviewers comments, a brief section on diatoms, a...http://books.google.it/books/about/Common_freshwater_algae_of_the_United_St.html?hl=it&id=h01FAQAAIAAJ&utm_source=gb-gplus-shareCommon freshwater algae of the United States
