Not much to do with camping, but most of us outdoorsy-types appreciate the venerable USGS topographical maps. They've been publishing an interesting history of the maps in one of the obscure journals I read (ARCNews). They have from 1884-1980 posted online. The next chapter should be posted after the print edition comes out after New Years, so save the link and check back later.
This historic photo shows an early USGS topographer taking measurements while his assistant records the information on a field sketch. Imagine mapping our entire nation before GPS, lasers and four-wheel drive. Incredible.
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