Social Science

United States Census: http://www.census.gov/

C.I.A. World Factbook: https://www.cia.gov/library/publications/the-world-factbook/index.html

United Nations: http://www.un.org/en

United States Presidents: https://www.whitehouse.gov/1600/Presidents

BBC Historic Figures (archived page): http://www.bbc.co.uk/history/historic_figures/a.shtml

Library of Congress Prints and Photographs Online Collection: http://www.loc.gov/pictures/

U.S. Department of State: http://www.state.gov