Scope and Contents The objects of the joint investigations were to provide a general plan for the development and settlement of the Columbia Basin area as a whole, and detailed plans for areas to be irrigated. The topographic surveys and land classifications of the Bureau of Reclamation served as a base for the investigations. Twenty-eight separate problems, in addition to the basic engineering surveys, were set up for study. The problems were divided into 16 divisions. Lead investigators included Dr. E. N....