411 REFERENCE · Wikibooks
Gardening
Reference material by Wikibooks contributors. This retains its source identity and is not 411 news reporting.
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Horticulture
This is a free textbook about the practice of gardening which you can help write!200px
Manual of Gardening
Home Vegetable Gardening
These are public-domain books about gardening in the United States in the early 20th-century.