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.
With an average flow at the mouth of about 265,000 cubic feet per second (7,500 m3/s), the Columbia is the largest river by volume flowing into the Pacific from North America and is the fourth-largest by volume in the US.