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Facilitates the recognition of fresh-water organisms, both in the field and in the laboratory. Generic names are applied in an inclusive sense to groups of species that a beginner may recognize by external differences. This book can be used as a supplement in field biology courses... Read Full Overview

This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it.

This work is in the "public domain in the United States of America, and possibly other nations. Within the United States, you may freely... Read Full Overview

This work has been selected by scholars as being culturally important and is part of the knowledge base of civilization as we know it.

This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely... Read Full Overview