1. Preliminary photogeologic map of Chiapas, Mexico and adjacent northwestern Guatemala prepared from Seasat radar image [cartographic material] Yale Public content 1982. 2023-06-06T19:40:24Z. 2023-06-09T21:37:14Z. Rowan, Lawrence C. U.S. Geological Survey. English. cartographic image. Public. Mexico, Chiapas., Guatemala., Chiapas, and Guatemala.