I've just posted a pdf file of the slides from the powerpoint talk I gave in Boston over the summer at the Association for the Study of Food and Society (AFSF) and the Agriculture, Food, and Human Values Society (AFHVS) joint conference. Hope you find them helpful. I had to delete some of the graphics since I was worried about protecting photographers' rights. For a summary of the presentation see the posting on June 12. By the way, in case you don't recognize it, the picture to the left is the cover of Laurens van der Post's classic 1970 African Cooking, a volume in the Time-Life Foods of the World series.