Great Unknown of the Rio Grande: Terlingua Creek to La Linda, including Boquillas Canyon and Mariscal Canyon;

This guidebook for canoeing, kayaking or rafting the Rio Grande covers three sections of the river in Big Bend National Park in Texas: the Great Unknown, Mariscal Canyon and Boquillas Canyon. This region bordering the Rio Grande was a center for mining, ranching and farming from the end of the Indian Wars in the late 19th century until the establishment of the national park in the early 1940's.