Lately I'm unable to find documents on NTRS that used to be available. Example:
"F-1 Rocket Engine Operating Instructions" used to be available. It is referenced on this page on heroicrelics.org with URL:
http://ntrs.nasa.gov/search.jsp?N=0&Ntk=all&Ntx=mode%20matchall&Ntt=19750070175. This now gives a "Page not found" error.
In this answer user jumpjack mentions that some links have changed:
I also found this forum post listing all "Apollo experience reports" available on NTRS site, but beware that all links are broken due to server change; anyware the documents numbers are still valid.
For example, this link is invalid:
You must convert it to:
However, that last link also doesn't work any more. In fact, many links in that post, which is very recent, from 21 January 2022, are broken now.
Some documents can be found elsewhere, e.g. ibiblio.org or archive.org, but that mileage varies a lot.
Anyone have a clue of what's going on? Do we need to start an ibiblio.org or archive.org project?