Elevations and Distances in the United States "Elevations and Distances in the United States" Elevations and Distances in the United States "Elevations and Distances in the United States" Elevations and Distances in the United States USGS Elevations and Distances Elevations and Distances in the United States "Elevations and Distances in the United States" Elevations and Distances in the United States the two most distant points "Elevations and Distances in the United States" https://pubs.usgs.gov/gip/Elevations-Distances/elvadist.html Elevations and Distances in the United States Source Elevations and Distances in the United States