CIA World Factbook

  • U.S. government profiles of countries and territories around the world.

Library of Congress – American Memory

  • Free and open access to written and spoken words, sound recordings, still and moving images, prints, maps, and sheet music that document the American experience.

Maine Memory Network

  • A statewide digital museum that provides access to historical items from over 250 museums, historical societies, etc.

Public Library of Science

  • Non-profit publisher and advocacy organization for open-access information in scientific and medical research.