Scanned 1971 model rocket builder's manual

This site is hosting a 16-page PDF of a scanned in 1971 model-rocket designers' guide, with instructions for building multi-stage and payload-carrying rockets. Link (via Make Blog)

Update: Mike sez, "Here's the competition's 1971 catalog. The two companies later merged, and the resulting company and technology survives to this day. At least one kit from that era is still being sold."