This article is from the Aquaria Resources: Societies, Books and Mailorder FAQ, by numerous authors.
Look through the used book stores. Books from 20-30 years ago may have
wrong Latin names for some of the fish, claim that certain species of
now-common fish are hard to breed, and may have less than adequate
coverage of filtration, but those books are still excellent general
references and (should) cost very little.
 
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