The Foods of the World series seeks to expose the reader to the indigenous cuisine from various areas of the world. Each volume represents the cooking techniques and styles used in one specific region, and in all they are pretty thorough. There is also a series of recipe binders that go along with this series; the titles are the same as the hardcover books but they are spiral bound.
Four more items exist; a short set of volumes (Kitchen Guide, Menu Guide and Recipe Index, Supplement 1 and Supplement 2) that are harder to get info on. I have heard these are softcover and similar to pamphlets.