Citations and abstracts to articles and preprints in astronomy and physics; fulltext searching is possible. Operated by the Smithsonian Astrophysical Observatory and the Center for Astrophysics at Harvard University.
Provides primary sources documenting immigration to the United States and Canada from 1800 to 1950, including interviews, diaries, letters, oral histories, personal narratives, and more.
Includes oral histories, personal writings, drawings, photographs, biographies, autobiographies, audio files and more related to American Indians, Alaska Natives, and Canadian First Peoples. Find collections related to specific events, people, tribes, and more.