Canyon Country Parklands: Treasures of the Great Plateau by Scott Thybony (National Geographic) (1993)

Hardcover with DJ in Very Good (VG) condition. Clean and straight. Maj. John Wesley Powell called parts of it "the Great Unknown." In 1869 the soldier-turned-geologist first led an expedition into this unmapped, 130,000-square-mile region now shared by Colorado, Utah, New Mexico, and Arizona. He found a land of high, desert-like plateaus that in places rose nearly two miles above sea level. Streams and rivers scored the land, slashing awesome canyons and scooping out amphitheaters filled with fantastic rock formations.