Cool find by my old pal Billy Baque:

As a guidebook for the NASA Photography Training Program, it not only describes the operation of the Hasselblad 500 EL/M cameras used on the U. S. Space Shuttle but is also a concise manual on photography to assist astronauts in creating the best possible space photographs.

As Billy says, “[i]t makes working on the shuttle seem less glamorous and a lot more like hard, hard work.” The PDF is hosted by Hasselblad itself.