The Art of Turkish Cooking - Ne$et Eren
A Book of Middle Eastern Food - Claudia Roden (classic, I grew up with it in my mom's arsenal)
The Korean Kitchen - Copeland Marks
Trattoria Cooking - Biba Caggiano
The New York Cookbook - Molly O'Neill
The New York Times Bread & Soup Cookbook
At the Japanese Table - Lesley Downer
A Little Taste of India
And many volumes of the excellent British Hermes House series, available amongst the Borders cheapy books: Clay-pot, Curry, Fish, Indian, Japanese, Jewish, Mexican, Sauces, Soup, Spanish, Thai, and Vegetarian.