It contains many abstracts to technical reports not indexed in other databases. NTIS is equivalent to the Government Announcements Index. International Selective index to books, articles, and documents relating to politics, economics, government, and international relations. Indexes over 4500 publications covering all aspects of the sciences. Indexes over 5000 publications covering all aspects of the social sciences.
Primary sources are the original, first-hand accounts of a subject or event.
They include letters, diaries, manuscripts, autobiographies, interviews, opinions, surveys, investigations, court testimony and depositions, and government documents. You will find primary source material in books, bibliographies, newspapers, and periodicals. For a detailed explanation on how to locate and use primary sources, see Library Research Using Primary Sources , from UC-Berkeley, or Primary Sources Research , from Yale University. Who Have Died Between the Years 1851-1900. Biography Index Indexes over 2700 English-language publications from 1946 to the present.