USGS 7.5” Topographic Standards and Specifications
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Tomorrow is the United States Geological Survey's 133rd birthday. In honor of one of my favorite institutions (and on the heels of my leap-day posting of the strangest 7.5-minute quad), I present you with this spec sheet.
Got this a while ago. Not sure if this will resonate outside of the hardcore-map-geek circles, but this is the chart of USGS 7.5” Topographic Standards and Specifications.