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The only book that will help you identify major groups of bacteria in the field without a microscope.
Guide to Microlife GB
A field guide to bacteria seen under a microscope.
How to Know the Protozoa GB Archive
A specific type of bateria is the protozoa.
Freshwater Dinoflagellates of North America GB
Free-Living Freshwater Protozoa: A Color Guide Am PDF
Books to learn more about bacteria in general include A Field Guide to Germs, Human Wildlife: The Life That Lives on Us and Thieves, Deceivers, and Killers.
A microbiology textbook and altas that has gotten lots of good reviews on Amazon.
Exploring with the Microscope GB
Everything you need to know about microscopes.
Using the Microscope: A Guide for Naturalists GB
Freshwater Sponges & Bryozoans
Freshwater sponges (Porifera, Spongillidae) of eastern Canada: taxonomy, distribution, and ecology
Taxonomy, distribution and ecology of the freshwater sponges (Pori fera: Spongillidae) and bryozoans (Ectoprocta) of Eastern Canada