Sayer, Arthur Penrice (Brevet Colonel), Special Lecture on Military Bridging. London, Institution of Civil Engineers, 1934. 8.5x5.25", 16pp, four photographic plates. Cloth binding. Separate printing from the Institute. Very good copy, from the Library of Congress (Pamphlet Collection). $35
Interesting detail in this small image showing the human-powered launching of a portable box-girder bridge:
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