These three plates were used to print USGS topographic maps of Rock Island. Each paper would have be
These three plates were used to print USGS topographic maps of Rock Island. Each paper would have been run through three times to catch all the details of each plate on the same sheet. The first photo shows the plate that added contour lines, the second added bodies of water, and the third added cities, roads, latitude, and longitude.Sorry for the poor photo quality. Turns out it’s extremely difficult to photograph highly reflective copper. -- source link
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