The Vault — Food
Seed saving and rotation after year one
Survival gardening and sustainable gardening are different skills. The abridged entry covers open-pollinated vs hybrid seed, the crops most forgiving of saved seed, and a simple four-bed rotation that holds without lab testing.
The full database entry includes the regional planting tables and the seed-viability data — those back the relevant chapters in the books.
This is the abridged entry. The full database record — sources, tables, and procedures — backs the books rather than the public site.