The DLWRR Delaware River Viaduct Thesis by A. Burton Cohen dated June 1910. A. Burton Cohen was a candidate for Civil Engineering degree at Purdue University. The thesis covers the design methodology for the Delaware River Viaduct structure built of concrete and comprising five 150-ft. and two 120-ft. elliptical arches of 40 ft. rise. The thesis statement is 21 pages in total plus eight exhibits (some exhibits are fold-out) depicted on reverse blueprint color paper which include: Plate I - Analysis of 150-ft. Elliptical Arch for Half Live Load plus Dead load; Plate II - Analysis of 150-ft. Elliptical Arch for Dead Load; Plate III - Analysis of 150-ft. Elliptical Arch for Full Live Load plus Dead Load; Plate IV - Analysis of East Abutment Retaining Wall; and four other Table pages of data and loading information. The Thesis measures 8' x 10 3/4" and is further protected by a 9" x 12" folder - all are original. While there is some very minor tears in the front/rear covers and the protective folder, the overall condition is exceptional. $150.00 cash payment at local pick-up only in Blairstown, NJ.