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.
The lower section of the Columbia River was first explored and described by Captain Bruno Heceta (sometimes spelled Hezeta), who named it Bahia de la Asumpcion. Captain Robert Gray explored it in 1792 for the United States and Broughton navigated it 119 statute miles upriver from its mouth the same year.