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.
Runoff from the states of Wyoming, Utah, Nevada, Idaho, Oregon, and Washington combines in the Snake, which has a drainage basin of some 109,000 square miles (282,000 square km). From elevations of 10,000 feet (3,000 metres) the river descends to 300 feet (90 metres) at its outflow into the Columbia. The upper Snake River, above King Hill, Idaho, is used for irrigation and hydropower. The main stream is regulated by several dams and reservoirs, the most expansive being American Fall Dam and Reservoir.