Header image: 'First flight, 120 feet in 12 seconds', John T. Daniels; 17 December 1903. Courtesy of the Library of Congress.
Imagery: Original digital studies by the curator and curated Public Domain archival photography including:
The Bank of England, London. Photographer Unknown; c. 1905. Image sourced via Public Domain.
World War One gun crew during an advance against German positions. Photographer Unknown, c1917. Courtesy of the Harry S. Truman Library & Museum.
Photograph of two men during the Great Depression. Photographer Unknown; c. 1930. Image sourced via Public Domain.
American troops approaching Omaha Beach on Normandy Beach, D-Day. Photographer Unknown, 1944. Image sourced via Public Domain.
Every effort has been made to trace the original creators of archival media; where unknown, items are credited by era and source.