Unidentified photographer 1908, 7 July [Alexander Graham Bell (right) and his assistants observing the progress of one of his tetrahedral kites]
Photographic print Library of Congress, Prints and Photographs Division Reproduction Number: LC-DIG-ppmsca-51814 (digital file from original) LC-G9-Z1-116,451-A (b&w film copy neg.), Call Number: LOT 11533-10-26, no. 7 [P&P]
