A guide to tuning the sails and rigs of yachts and small keelboats, featuring step-by-step instructions and more than 150 illustrations.

The U.S. Army’s official guide to map reading, determining location, and navigating For a soldier, knowing where you are is a matter of life and death, and so

The concept of the earth as a sphere has been around for centuries, emerging around the time of Pythagoras in the sixth century BC, and eventually becoming domi