students， educators， meeting papers， research reports， 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 technical videos. NTRS is Open Archives Initiative Protocol for Metadata Harvesting (OAI-PMH) enabled ，000 aerospace-related citations， images。

journal articles。

and over 500，000 full-text online documents， The NTRS is a valuable resource for researchers， over 200，。

patents。

and the public to access NASAs current and historical technical literature and engineering results. Over 500。