OBERS 1972 projections : economic activity in the US, by economic area, water resources region and subarea, State and SMSA [Standard metropolitan statistical area] and non-SMSA portions of the areas, historical and projected, 1929-2020 / prepared by the US Department of commerce, Social and economic statistics administration, Bureau of economic analysis, Regional economic analysis division and the US Department of agriculture, Economic research service, Natural resources economics division ; for the US Water resources council

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