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A study of hog questionnaire modifications
- Kleweno, Douglas G., Steiner, Michael A., and United States Department of Agriculture. Statistical Reporting Service. Statistical Research Division.
- SRS staff report ; no. 84 1985
- Agricultural surveys, Swine -- United States, Swine farrowing facilities -- United States -- Statistics, statistics, swine, farrowing rate, and United States
- U.S. Dept. of Agriculture, Statistical Reporting Service, Statistical Research Division
- USDA publications