iFixit makes world’s largest medical repair database for free
I’m not super familiar with iFixit but thought this was cool. They organized 200 volunteers and gathered 13,000 different repair manuals for equipment that hospitals use, then made it available for free online:
Although these aren’t the most important documents you’d want to have saved for a knowledge library, if you’ve already got the basics covered this could be interesting to add to your collection. Super unlikely, but how cool would it be to be able to fix a ventilator or something in a SHTF environment!