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and towns. Expansion of urban areas in the Salt River Valley to accommodate the population growth has been largely onto the farm lands of the Salt River Project and adjoining agricultural areas. In 1960, Phoenix alone included 43,500 acres of Salt River Project lands which were formerly irrigated. City limits have been expanded, encompassing lands of low population density, which will provide corporate administration and services to these outlying areas as the densities increase. Water availability within the agricultural zones will tend to concentrate urban growth for some time as in the past. The economic dynamics of large subdivision development, however, have caused a scatteration of high population density clusters held apart by large extents of low population density acreage. The continuing growth of the urban areas will increase the population density in the central metropolitan area as the vacant land is utilized and vertical construction continues. As the urban growth encroaches on the agricultural lands, the water supply formerly used for irrigation will serve domestic and other municipal purposes. In Tucson, parts of metropolitan Phoenix, and other localities, similar growth has taken place over desert lands not previously irrigated. Under these circumstances, possibilities are not present for transferring existing water supplies from agricultural to urban use. Industry--In manufacturing for 1960, the food and kindred products processing industry was second only to the aircraft and transportation equipment industry. Other important industries include primary metals, electrical and other machinery, printing and publishing, stone, clay, and glass products, metal fabrication, chemicals, and apparel. Manufacturing is followed by mining and tourism in economic importance to the area. 7Epson Perfection 4870 Photo, 400 dpi, 8 bit, 14,188,544 byte