778 pages. The Army's complete welding education in one volume — oxyfuel, stick, MIG, TIG, brazing, cutting, metallurgy, weld symbols, joint design, testing, and field repair of just about every metal you'll meet. Commercial reprinters sell this exact book in paperback for $28.
 
If you fix your own equipment or want to start fabricating, this is the deepest five bucks you'll ever spend. Official public-release edition from the Army's own publishing site.
 
778 pages · Instant digital delivery (PDF)
 
Based on public-domain U.S. government material. Not affiliated with or endorsed by the U.S. Army or Department of Defense.