1977. 2018-06-21T17:44:44Z. 2018-06-21T18:19:40Z. National Geophysical and Solar-Terrestrial Data Center. National Geophysical and Solar-Terrestrial Data Center. English. cartographic image. Public. West (U.S.), U.S., and United States, West.
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1978. 2014-03-28T13:58:04Z. 2014-04-08T22:10:30Z. Luedke, Robert G. Dept. of the Interior, U.S. Geological Survey. English. Public. Arizona, New Mexico, and U.S. Cenozoic and From 65 million years ago.
1982. 2016-01-11T16:10:20Z. 2016-07-14T21:07:57Z. Izett, Glen Arthur, 1928-. U.S. Geological Survey. English. cartographic image. Public. United States, Saskatchewan, U.S., Canada, Saskatchewan., and United States.