the: NH oMCwy! FOUN Ww * ou
 
TUNNELS
United States. Army. Corps of Engineers.
Design for an improved submarine tunnel : comprising a brick arch within a cast or wrought iron skin, laid in a trench dredged for that purpose. / by Lieut. Col. J.G. Foster, Corps of Engrs. «.. —-~ [Washingiton,, Dai e £¢ @.n.J, LE68.
8 p., [5] leaves of plates (1 folded) ; 30 cm.
Lettered on cover: ‘''Engineer Department, U.S.A. Submarine Tunnel. Foster. 1868.''
Publisher's binding : blind &
gilted-stamped (cont. @ next card) 30-6130
19516