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1 results containing "Pontoon bridges--1910-1920."
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Larger image available only at the Library of Congress
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The U.S. Engineers need you
[1917] | 1 print (poster) | Carlson, George L.
POS - US .C374, no. 3 (C size) [P&P] | LC-USZC4-9728 (color film copy transparency)
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