Eastern End of Deer Island, Surveyed in June 1863

This is an interesting and unusual pieces. As near as I can tell, it is a fictional map prepared by John Smith for illustrating the new topographic mapping styles. It appears to be the precursor to our modern USGS Topo maps we are all familiar with. This map is part of the diagrams that pertain to Appendix 22 in the Report of 1865. This has color printing showing the contour lines and a label in red.

IMPORTANT NOTE:

All of our United States Coast Survey (USCS), United States Coast & Geodetic Survey (USC&GS), and similar maps and charts have been professionally unfolded and flattened using humidity baths, semi-permeable membrane, and drying blotter techniques. Most others you typically see on eBay have not been, and worse, are quickly and crudely unfolded for the low-quality photos you see. Unfolding these maps in that way is damaging and weakens them. Please be aware.