Willoughby, C. L., & Philippoteaux, P. (1881). Cyclorama of the Battle of Gettysburg by Paul Philippoteaux: Permanently located in Boston, Mass. on the Moody and Sankey Tabernacle Site, Tremont Street (between Berkeley and Clarendon Streets), C.L. Willoughby, Sole Proprietor. [United States]: s.n..

Willoughby, C. L., and Paul Philippoteaux. Cyclorama of the Battle of Gettysburg By Paul Philippoteaux: Permanently Located in Boston, Mass. On the Moody and Sankey Tabernacle Site, Tremont Street (between Berkeley and Clarendon Streets), C.L. Willoughby, Sole Proprietor. [United States]: s.n., 1881.

Willoughby, C. L., and Paul Philippoteaux. Cyclorama of the Battle of Gettysburg By Paul Philippoteaux: Permanently Located in Boston, Mass. On the Moody and Sankey Tabernacle Site, Tremont Street (between Berkeley and Clarendon Streets), C.L. Willoughby, Sole Proprietor. [United States]: s.n., 1881.