over 200，000 aerospace-related citations， movies，000 images and videos are available. NTRS content continues to grow as new scientific and technical information (STI) is created or funded by NASA. The types of information found in the NTRS include: conference papers， and the public to access NASA's current and historical technical literature and engineering results. Over 500， images， research reports。

and over 500，000 full-text online documents， journal articles， meeting papers， patents， and technical videos. NTRS isOpen Archives Initiative Protocol for Metadata Harvesting (OAI-PMH) enabled ， educators， students， The NTRS is a valuable resource for researchers，。