1. M. E. Kislev, A. Hartmann, & O. Bar-Yosef, "Early Domesticated Fig in the Jordan Valley," Science 312 (2 June 2006):1272. This domestication of the fig thus preceded that of cereal by about a thousand years, and of other fruit trees such as grape, olive, and date, by some five thousand years.
2. Ira J. Condit, "Fig Varieties: A Monograph," Hilgardia 23/11 (Feb 1955): 323. Condit describes more than 600 varieties on the market at the time of press.