>>509009507
Back when it was safe to get anywhere the main branch of the Seattle Public Library, I found it to be a useful resource for out of date materials. They had a fairly complete set of Sams Photofacts from 1950-1970 so I could get schematics for tube radios.

Starting about 20 years ago you could buy Photofacts in bulk for little more than postage on eBay so I didn't need to go anymore, which was fortunate because they replaced the an actual library to the faggoty architectural abomination in picrel.