PRIMARY SOURCES: Autobiographies and memoirs, Diaries, personal letters and correspondence, Interviews, surveys and fieldwork, Photographs, drawing, Works of art and literature, Books, magazine and newspaper articles and ads published at that time, Public opinion polls, Speeches , Original document (birth certificates, property deeds, trial transcripts), Research data, Official and unofficial records of government and government agencies, Artifacts of all kinds, Audio recordings, DVDs, and video recordings, Audio recordings, Government documents (reports, bills, hearings, etc), Patents, Technical reports, Scientific journal articles reporting experimental research, SECONDARY SOURCES: Works of criticism and interpretation, Textbooks, Biographies, Articles from magazines, journals and newspapers after the event, Commentaries and treaties, history books and other popular or scholarly books, Reference books like dictionaries, encyclopedias, etc, Websites, Literature reviews and review articles, Blogs, Internet communications on email, blogs, newsgroups,

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