Continuing the discussion from Mulberry: the king of tree fruits (for pigs):
For those of you interested in historical horticulture, there is a text-searchable library of all articles and books published by USDA researchers here: http://agricola.nal.usda.gov/
It is full of valuable information and also misinformation regarding taxinomic names – these can be updated by consulting the USDA GRIN Taxonomy for Plants.
One of the gems I found in the NAL library is the 1st report of the Department of Agricuture in 1863 by Isaac Newton (the U.S. guy, not the British guy).
Isaac_Newton_1st_Report.pdf (1.2 MB)