Hardcover is firm and hinges are not cracked or damaged. Pages are tight and clean. Boards have light shelfwear and rubbing to edges. DJ protected with mylar and not clipped. Retired library edition has usual marks and attachments. Pocket removed. 139 pages. HardCover Binding. Year: 1965. ISBN: 0. New Methodology and some preliminary projections, 1954 - 1980. More than 90 percent of all the water used in the western United States is for irrigation. Because of the increased competition for water, it is important, in planning further irrigation, to know the actual economic demand for such water use. In some areas of the country conflicts have already developed between irrigation water use and other water uses.