sources on steganography

I am writing my dissertation on steganography. Basically I'm writing a technical monograph that would be of use to undergraduate instructors. What do you think are the best sources on steganography on the Web? What about books other than Johnson, Katzenbeiser & Peticolas, and the volumes covering the four international workshops on information hiding. I am also interested in the history of the subject. One major problem with the available sources covering the history (like Kahn) is that they completely disregard China, India, and Arab countries. Any pointers? thanks, hector