During its existence, NACA [National Advisory Committee for Aeronautics ] produced thousands of (technical) reports, many of which still have relevance to today’s researchers and engineers in aeronautics and aerodynamics. While many of the reports are only available in hardcopy, in the last decade or so, a substantial number of the reports - over 14,000 - have been digitised and made available online.
These digitised reports are still available despite the demise of the NACA Reports Server. They can now be accessed from the NASA Technical Reports Server (NTRS). http://ntrs.nasa.gov/search.jsp (Princeton University Library also houses a very substantial number of these reports in print or on microfiche.) Resource (below), via docuticker http://www.docuticker.com http://aerade.cranfield.ac.uk/newsletter0207/page3.html