Primary sources: First hand accounts, including photographs, journals, letters, government documents, interviews.
Chicago Coliseum. 1912.
Library of Congress.
To find primary sources, search for letters, diaries, autobiographies, government documents of the time period. For example, search for "Martin Luther King Jr and letters" or "Martin Luther King Jr and government documents". You can also add "primary sources" to your search, for example, "woman suffrage and primary sources."