A Manual of the Principles and Practice of Road-Making
- Full text of Gillespie's book which was published in 1864.
- http://quod.lib.umich.edu/cgi/t/text/text-idx?c=moa;idno=AKR5094

A Treatise on Land Surveying
- Comprising the theory developed from five elementary principles; and the practice with the chain alone, the compass, the transit, the theodolite, the plane table. Full text published in 1855.
- http://quod.lib.umich.edu/cgi/t/text/text-idx?c=moa;idno=AJQ3938

Notes on the Strength of Materials and the Stability of Structures
- Gillespies 1870 notes printed for the civil engineering classes in Union College.
- http://quod.lib.umich.edu/cgi/t/text/text-idx?c=moa;idno=AJP9662

Union College Math Department History - 1826 - 1877
- Short commentary on Gillespie years at Union College.
- http://www.math.union.edu/about/history/jackson.html