Sturtevant's Edible Plants of the World / Notes on Edible Plants
New York Agricultural Experiment Station (1919; public-domain scan on Internet Archive)
Encyclopedic coverage of ~3,000 edible species worldwide (uses, history, parts eaten) — deep 'library shelf' content that differentiates a paid product, at zero licensing cost.
Editor's notes
MUST carry a prominent modern-safety disclaimer: 1919 taxonomy is outdated, some plants then considered edible are now known toxic, and preparation notes predate modern food safety. Text-only (no useful ID images) — never present as an identification tool.
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Scanned PDF/DjVu/EPUB (~700 pages); text version at http://www.swsbm.com/Ephemera/Sturtevants_Edible_Plants.pdf
~30-60 MB scan
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Source & license
Public domain (US publication before 1930).
Use of this material does not imply endorsement by its publisher or any government agency.