On USGS quadrangle maps from 1947-1992, oil wells are marked by hollow black circles. Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert!
On USGS quadrangle maps from 1947-1992, oil wells are marked by hollow black circles. For a human, that’s easy to see, but for an AI, it’s not so clear. Image credits: Historical Topographic ...