The Corps of Discovery's exploration of the western United States between 1804 and 1806 resulted in a vast amount of information about the peoples, birds and other wildlife, and flora the expedition members encountered. This book pairs excerpts from the Reuben Gold Thwaites edition of the Lewis and Clark journals with images of landscapes and artefacts, allowing readers to better see and understand the explorers' journey from the Rockies to the Pacific Ocean. Many of the historic photographs show sites that have since been transformed or eradicated by geological or human forces. Emory Strong was a mechanical engineer and amateur archaeologist and pre-historian. Ruth Strong was a teacher and a vocational botanist. Herbert K. Beals is a historian of maritime explorations of the Northwest Coast.