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Key to the families of North American insects; an introduction to the classification of insects, by Charles T. Brues and A.L. Melander

KEY TO THE FAMILIES OF NORTH AMERICAN INSECTS AN INTRODUCTION TO THE CLASSIFICATION OF INSECTS BY CHARLES T BRUES AND AL MELANDER ...
insider.si.edu

Ecology and classification of North American freshwater invertebrates / edited by James H. Thorp and Alan P. Covich

Introduction to freshwater invertebrates / James H. Thorp and Alan P. Covich -- An overview of freshwater habitats / James H. Thorp and Alan P. Covich -- Protozoa / William D. Taylor and Robert W.