Relief shown by hachures.; Profile: Section of the proposed breakwater.; Probably detached from a document in the congressional series, doc. 194. Scale approximately 1:1,520,640. 24 inches to 1 mile.
Berrien, John Macpherson, -1876, cartographer. (n.d.). Survey of the mouth of Trail Creek, Indiana. Army Corps Of Engineers. http://purl.dlib.indiana.edu/iudl/images/VAC3073/VAC3073-M-00024 (map)