3 books
Water Supply of and Geological Notes on the Rhein Valley (Classic Reprint)
Reports on the Construction of the Piers of the Aqueduct of the Alexandrian Canal Across the Potomac River at Georgetown; District of Columbia, by William Turnbull, 1835-1840
Report of a Reconnoissance Made in 1835, from the Seat of Government; By the Way of Green Bay and the Wisconsin Territory, to the Coteau de Prairie