by Henry J Kauffman. 1972.
A good, thorough, albeit short read on the development of axes in North America. Lots of illustrations. One of very few books written on the subject. Authoritative and to the point.
Interesting about nonfiction books is that you usually know rather quickly whether what's written is worthwhile or if what you're really after is in the bibliography. If you're interested in axes, you'll welcome this information as a good framework or springboard.
Trust me, axes are very, very cool.