The National Technical Information Service (NTIS) maintains and disseminates a large collection of scientific, technical, engineering, and business-related information produced for and by U.S. government agencies. The NTIS database contains the records of millions of publications along with audiovisual materials, computer data files, and software. Nearly 1,000 new items are added weekly, many only available through NTIS. Recently, the Web-based database was extended back to 1964, and its search capabilities have been enhanced. Over 3 million items are in the NTIS database.