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How to Know the Protozoa (Pictured Key Nature Series) Author: Theodore L Jahn Manufacturer: McGraw-Hill Science/Engineering/Math Offer: $54.06	Guide to Microlife Author: Kenneth G. Rainis Manufacturer: Franklin Watts ListPrice: $36.00 Offer: $23.76	How to Know the Freshwater Algae Author: G. W Prescott Manufacturer: McGraw-Hill Science/Engineering/Math Offer: $54.06
Diatoms of North America Author: William Vinyard Manufacturer: Mad River Press ListPrice: $12.00 Offer: $12.00	Explore the World Using Protozoa Manufacturer: National Science Teachers Association ListPrice: $26.95 Offer: $26.95	Ecology and Classification of North American Freshwater Invertebrates Manufacturer: Academic Press ListPrice: $113.00 Offer: $90.40
A World in a Drop of Water: Exploring with a Microscope Author: Alvin Silverstein Manufacturer: Dover Publications ListPrice: $4.95 Offer: $4.95	Pond Life: Revised and Updated (A Golden Guide from St. Martin's Press) Author: George K. Reid Manufacturer: Golden Guides from St. Martin's Press ListPrice: $6.95 Offer: $6.95	A Field Guide to Bacteria (Comstock Book) Author: Betsey Dexter Dyer Manufacturer: Cornell University Press ListPrice: $26.00 Offer: $17.16
Diatoms: Biology and Morphology of the Genera Author: F. E. Round Manufacturer: Cambridge University Press ListPrice: $80.00 Offer: $72.00