As this question is more about resources to ask/answer questions than actual space exploration, I am asking it on meta. Feel free to adjust tags as appropriate.
The NASA Technical Reports Server allows searching from three databases:
- NASA STI (536297)
- NACA (14612)
- NIX (466225)
The first is obviously NASA's own document collection. The second is NASA's predecessor agency, the National Advisory Committee on Aeronautics.
What is NIX? I usually have it unchecked; does it have any documents that would reasonably help ask or answer a question?