Depending on whether you're looking for a research paper on the history and physics of axes or instructions for a literal "paper axe" craft, there are several authoritative resources available.
: Axe heads generally fall into three weight classes: Hatchet (1.25–1.5 lb), Boy’s/House Axe (2–3 lb), and Felling Axe (3.5–6 lb). Paper Crafting Instructions ax head
If you need a comprehensive guide on the evolution, anatomy, and maintenance of an axe head, these professional publications are highly regarded: Depending on whether you're looking for a research
: For efficiency, the cutting edge (bit) angle should be tailored to the wood type: 20° to 25° for dry wood and 15° to 20° for green wood. Boy’s/House Axe (2–3 lb)
