Digitized technical reports published prior to 1975. The following are some of the included series: National Bureau of Standards- Building Materials & Structures Reports, and Building Science Series; US Bureau of Mines- Miners Circular, Technical Progress Reports, and Mineral Issues.
1915-present. Access to NASA's current and historical aerospace research and engineering results. NTRS integrates three separate information collections: NACA collection (1915-1958); NASA Collection (1958-present); NIX Collection (images and media files).