An old map

I was cleaning up the basement and came across an old book about mapping. It has a chapter on visibility, referring to how to interpret a contour map and figure out what you can see from a given spot. The map below is an example, with the shaded areas showing places you couldn't see from point A.



The book, from 1917, is Military Map Reading and Sketching Including Contouring by Major C.O. Sherrill.

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