Illustrated book of appropriate technologies.

Greetings, all.  Last year I published a short illustrated book on appropriate technologies including passive solar design strategies, heating devices, et al.  It is a basic primer and will not present much if any new information to long time permies, but I thought it would be worth a share as a starting point for anyone who is just getting familiar with these concepts. I hope someone finds it useful.  
http://ehrlum.com/lthr/

Gregg

This is a great book!