This collection consists of original correspondence to and from Chauncey Barnard, Jr., civil engineer, of Hartford, Connecticut. It is comprised of sixty-two original letters and documents from the 1830s to 1860 (most of the letters date from the 1830s), revealing much about the practical challenges early 19th century civil engineers faced. Most of the correspondence describes railroad and canal surveying, including discussions of jobs, finances, lawsuits and supplies. A majority of the letters relates to the early Mauch Chunk Switch Back Railway for which Barnard served as engineer. Other railroads described in this correspondence include: the Lehigh Coal and Navigation Co. (with which the Mauch Chunk connected), the Erie Railroad, the Savannah & Macon Railroad, and the Beaver Meadow Railroad & Coal Co. Correspondents include: E. A. Douglas, Edwin F. Johnson, William Parker, and Louis Waldo.

L.O. Reyolds to Chauncey Barnard, December 29, 1834

L.O.R to Chauncey Barnard, May 17, 1836

Jno Liesering Jr to Chauncey Barnard, March 11, 1837

L.O. Reyolds to Chauncey Barnard, Febrary 3, 1835

L.O. Reyolds to Chauncey Barnard, April 29, 1938

P.V. Merricke to the Stockholders of the Pennsylvania Railroad Company, September 16, 1848

A True Copy of Minutes for the Philadelphia Sunbury Railroad Company, March 20, 1865

S.O. Reyolds to Chaucey Barnard, July 3, 1836

Th. Lehigh to Chaucey Barnard, July 7, 1836

Jno Liesering J. to Chaucey Barnard