Engineering Village is the search interface to four engineering databases: Compendex, Inspec, NTIS, and Knovel. Compendex (1884-present) indexes citations and abstracts from over 5,000 engineering journals, conference papers, books, patents, dissertations, and technical reports. Inspec (1898-present) indexes citations and abstracts from journal articles, conference proceedings, books, and dissertations in engineering and physical sciences. NTIS (1964-present) indexes citations and abstracts of National Technical Information Service reports and audiovisual materials from sources such as NASA and the departments of Energy and Defense. Knovel provides ebooks on engineering and related subjects.