eTextbook of "The Economy of Nature, 6th Edition" by R. E. Ricklefs (c2010). Smallish bookmarked, page-numbered PDF file (35 MB) with table of contents, glossary and index. TOC with direct linking to text (hidden bookmarks). Quasi-native PDF quality.
Description and table of contents: http://www.whfreeman.com/Catalog/product/economyofnature-sixthedition-ricklefs
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