NASA Workmanship Standards Pictorial Reference
This is a copy of NASA Workmanship Standards Pictorial Reference
NASA's copy at their site is a bit hard to navigate and print. The copy here is the whole Pictorial Reference compiled and ordered in one handy 308 megabyte, 306 page PDF:
Example page from Pictorial Reference:
Note: Many of these standards have been replaced. This reference is from 2002 era. Many of the new standards aren't freely available anymore.
See the standards/ directory for PDFs of various standards referenced in the Pictorial Reference.