Volume 31, Bulletins 392-412. (392) Educational Needs of Less Privileged homemakers in a Rural County in Iowa; (393) Improving Farm Rental Arrangements in Iowa; (394) Transferring Farm Property within Families in Iowa; (395) Structure of the Iowa Retail Lumber Industry; (396) Estimations of Optimum Plot Size Using Data from Bromegrass Uniformity Trials; (397) Analysis of Tomato Yield Components in Terms of Genotypic and Environmental Effects; (398) Interdependence Between the Farm Business and the Farm Household with Implications on Economic Efficiency; (399) Effects of Grass Competition Upon the Establishment of Hardwood Plantations in Iowa; (400) Effects of Certain Components of Simulated Hail Injury on Soybeans and Corn; (401) Productivity and Income of Labor and Capital on Marshall Silt Loam Farms in Relation to Conservation Farming; (402) Objective Grade Specifications for Slaughter Steer Carcasses; (403) Economics of Some Soil Conservation Practices; (404) Economic Instability and Choices Involving Income and Risk in Primary or Crop Production; (405) Economic Analysis of Trends in Beef Cattle and Hog Prices; (406) Significance of Soil Organic Phosphorus to Plant Growth; (407) Rural-Urban Migration in Iowa, 1940-50; (408) Exploratory Study of Expectations, Uncertainty and Farm Plans in Southern Iowa Agriculture; (409) New Procedures in Estimating Feed Substitution Rates and in Determining Economic Efficiency in Pork Production; (410) Application of Econometric Procedures to the Demands for Agricultural Products; (411) Genetic Factors Governing Resistance and Susceptibility of Oats to Puccinia coronata Corda var. avenae, F. and L., Race 57; (412) Resource Productivity and Returns on 160-Acre Farms in North-Central Iowa