BMW is a fun one! It is definitely meant for Air Force cadets in the early 70s (and the introduction says as much) so it's pretty approachable with a college freshman physics and calc background. The final "homework problem" is to stitch together the radar ranging, orbit determination, Lambert problem solving, and rocket guidance assignments from the previous chapters into a complete ICBM defense system. Pretty wild. And I think most of the code examples are in assembly.

As the author mentions, you can pick up a copy for well under $20. I'd say it's worth it for the 1960s-style diagrams and figures alone!