This book was written by Fuchisa Dunlop, an unique perspective from a westerner on Sichuan Cuisine. Some of her views are very revealing to locals grown up with Sichuan Cuisine.
Here is the Amazon link: http://www.amazon.com/Land-Plenty-Treasury-Authentic-Sichuan/dp/0393051773/ref=la_B001IGLRVG_1_2?s=books&ie=UTF8&qid=1465230885&sr=1-2
The price is little bit high and you may try your luck at your local library. :-)