Finding Primary Source Documents
In scholarship, primary documents are defined as those containing firsthand information or original data on a topic, and are used in preparing a derivative work. Primary sources include original manuscripts, periodical articles reporting original research or thought, diaries, memoirs, letters, journals, photographs, drawings, posters, film footage, sheet music, songs, interviews, government documents, public records, eyewitness accounts, newspaper clippings, etc (from Online Dictionary of Library and Information Science).
Some places to find primary source documents: