David McLouth, Composite Map A, date unknown
Here are two views of a giant composite map put together by David McLouth. Going through his stacks of papers, it took several passes before I realized that the graph paper had been regridded and coordinates noted at the intersection of each set of lines. A quick logical leap later and I realized that the sheets fit together into one uber-map. Initially despairing, I believed that I did not have the full collection of maps as the letter rangs were F through N and the numbers all in the high teens - it was until assembling the map that I realized that the clever mapmaker had chosen center coordinates that helped avoid negative numbers. Centering on the center of the alphabet instead of A and 0.
Here's a detail.
And here's a second composite map.