Assorted NASA pdf documents online

[flateric]

For those who knows this source it will be another cause to remember, for those who doesn't know - definitely worth to take a look.
Constantly refreshed links list of various *interesting* NASA pdf documents

http://www.geocities.com/bobandrepont/spacepdf.htm

Thanks to Bob Andrepont for this great research work.

 

[Archibald]

I felt in the secon category you mentioned, so thanks for the link!