The Exploration of the Colorado River and Its Canyons by John Wesley Powell is a classic of American exploration literature. It is about the Powell Geographic Expedition of 1869 which was the first trip down the Colorado River by boat, including the first trip through the Grand Canyon. The text first appeared in the January and February 1875 editions of Scribner's Magazine. The Smithsonian published it in book form in 1875 under title Report of the Exploration of the Columbia River of the West and Its Tributaries. Explored in 1869, 1870, 1871, and 1872, under the direction of the Secretary of the Smithsonian Institution. It was revised and published in 1895 as The Exploration of the Colorado River and Its Canyons. It includes hundreds of wood engravings, 12 by Powell and the rest commissioned by the Smithsonian, based on photographs and drawings by Thomas Moran.