Carol Deppe *Breed Your Own Vegetable Varieties: The Gardener's and
Farmer's Guide to Plant Breeding and Seed Saving, 2nd ed.*
<http://www.caroldeppe.com/byovv.html>
Franklin Hiram King *Farmers of Forty Centuries, Or Permanent Agriculture
in China, Korea and Japan <https://www.gutenberg.org/ebooks/5350>* [FULL
TEXT]