On the web there are a host of "e-books" that you can buy, often very cheaply. Most of them tell you that you have "duplication rights", meaning that you can sell them on. Well, we're going to save you the trouble. As a service to our members, we will share for free the ebooks in our possession:
Okinawan Kenpo Karate Jutsu Kumite Hen. This is an important book by Motobu Choki, deonstrating his set kumite drills. The heavy reliance on Naihanchi kata as the basis for this work should not be underestimated. Even if you can't read Japanese, these pictures tell a big story.