1. Map showing relation of carbon dioxide-rich springs and gas wells to the tectonic framework of the conterminous United States [cartographic material] Yale Public content 1982. 2015-06-29T18:06:41Z. 2015-07-14T22:10:10Z. Irwin, W. P. (William Porter), 1919-. U.S. Geological Survey. English. cartographic image. Public. United States.