You can search on scribd.com for navigation manuals. I found a good teaching manual"Australian Map Reading and Navigation". Techniques are the same, but be careful of declination and some other region specific information. The U.S. Military manuals are almost all available there, look for map reading and land navigation.

Available on Amazon.com for about $10: Wilderness Navigation: Finding Your Way Using Map, Compass, Altimeter & Gps (Mountaineers Outdoor Basics)


There was also a teaching kit available with a large compass for demonstration and a bunch of compasses for students, but I can't seem to find it.