Throughout the book Boll and his colleagues continuously stress the significance of the many important contributions that psychology has made to medical science's knowledge and understanding of the causes and consequences of physical and emotional illness.
There are more than 60 dams in the Columbia River watershed in the United States and Canada. Tributaries of the Columbia River and their dammed tributaries, as well as the main stem itself, each have their own list below. The dams are listed in the order as they are found from source to terminus.
David Thompson reached the source of the Columbia at Columbia Lake in present day British Columbia in 1807 and navigated the entire river in 1811. The first American settlement on the Columbia was Astoria, established at its mouth in 1811. Between the Pacific and the great bend near the confluence with the Snake River, the Columbia has represented the dividing line between Oregon and Washington since before Oregon became a state in 1859.