I collect a few things like stones, tools, puppets and agricultural books. My favorites are those published before the "Green Revolution" when fertilizer meant manure or soiling crops and pest control were chickens and field rotations. Some of my favorites:
Farmers of Forty Centuries; Permanent Agriculture in China, Korea and Japan; FH King 1911 and the The Culture of Vegetables and Flowers. Sutton, 1913.
The Small Farmers's Journal often lists booksellers of Farm Literature and has reprinted some treasures within its own pages.
I'll post a list of some great old farming books on the sidebar soon. In the meanwhile, and its not as satisfying as having those beautiful old pages sliding through your fingers, here are a couple of sites online that have great digitalized collections:
"The Core Historical Literature of Agriculture (CHLA) is a core electronic collection of agricultural texts published between the early nineteenth century and the middle to late twentieth century. Full-text materials cover agricultural economics, agricultural engineering, animal science, crops and their protection, food science,forestry, human nutrition, rural sociology, and soil science".
Free digitalized library on line with a collection of books on holistic agriculture, health and self-sufficient homestead living.
An excellent online collection of classic small farm books