Some of it is a bit dated (how to use a slide rule) but a lot of this
text is still incredibly relevant to anyone just getting into learning
about all the hardware around rocket systems, like cross sections of
regulators, AN fittings, crane hand signals, how to use a multimeter,
and first aid information when working with liquid fluorine.
https://www.dtsc-ssfl.com/files/lib_rcra_soils/group5/historicaldocs/PDF_Files/HDMSt00003783.pdf