Seed Production Guidelines
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Basic Concepts of Seed Production (pdf)

Onion Umbels
Allium Seed Production
(onions)
Celery
Apium Seed Production
(celery)
Brassica Flowering
Brassica Seed Production
(cole crops - cabbage, kale, etc)
Peppers
Capsicum Seed Production
(pepper)
Cucumber
Cucumis Seed Production
(cucumber)
Squash
Cucurbita Seed Production
(squash)
Tomato
Lycopersicon Seed Production
(tomato)
Dry Small-Seeded Specialty Seed: A Resource Guide for Oregon and Washington Growers
"Seed Production and Seed Sources of Organic Vegetables" by Jennifer Bonina and Daniel J. Cantliffe (University of Florida IFAS Extension) (pdf) 
Visit the Save Our Seed Project home page for more in-depth manuals about organic seed production. Highly recommended!!
The Organic Seed Partnership is funded through the USDA Organic Agriculture Research and Extension Initiative (Award No. 2004-51300-02229).