Ignition!: An Informal History of Liquid Rocket Propellants by John D. Clark. It’s a surprisingly fun read.

Been on a break for a bit, but before that we got a Tektronix 535A oscilloscope from the 1950s-60s up and running (with the exception of a gain issue with the vertical amplifier, haven’t quite figured out the cause yet), and did some work on reverse-engineering and emulating the analog filters of the MOS 8580 SID on an FPGA (still heavily WIP, haven’t gotten around to a rewrite yet so it’s still really jank, college is a bitch).