NOT the Orange Book – Guide to the Definition, Specification, Tasking, and Documentation for the Development of Secure Computer Systems — Including Condensations of the Members of the Rainbow Series and Related Documents”.
You can download it from the following link: https://packetstormsecurity.com/files/download/13845/ntob.htm
Source: https://packetstormsecurity.com/files/13845/ntob.htm.html