[MysticAlpaca]

Those sound like they are going to be expensive books. Because of their niche market you can get a good price on them and that material will last a long time so you could expect to see sales for many years will small revisions.

The first book should sell very well to the motor enthusiast crowd. I would buy it.

The others look intriguing as well for their respective fields. Are there consulting companies that go around and try to improve plant efficiency? This would be a great tool for that, also a really good business i would think.

--bill