I found a nice rocketry booklet from Estes from 1964 in an antique store in Martinez, CA several years ago. I scanned it and uploaded it: https://archive.org/details/model-rocketry-booklet/mode/2up

Pretty cool, I think. You can pull down the PDF if you like.

Covers the physics of model rocketry, shows you how to build a wind tunnel, talks about recovery, lifting capabilities, rocket-powered gliders, multi-staging, clustering, determining altitude.... (Stereotype humor on 2nd to last page depicting a Chinese man - near Peiping - holding an American model rocket.)