1. The inefficacy of trade policy;Baldwin Robert,1982
2. The political economy of the oil import quota;Barzel,1977
3. U.S. imports for consumption and general imports: TSUSA commodity by country of origin FT246;Bureau of the Census,1971
4. Sources of quality change in labor input;Chinloy;American Economic Review,1980
5. U.S. real product and real factor inputs, 1929–1967;Christensen Laurits;Review of Income and Wealth,1970