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The Panama Canal in transition : implications for U.S. agriculture
- Eriksen, Ken A. and United States Agricultural Marketing Service. Marketing and Transportation Analysis Program.
- Grain -- Transportation -- United States, Grain trade -- United States, grains, transportation, United States, Panama Canal Zone, and Panama Canal (Panama)
- U.S. Dept. of Agriculture, Agricultural Marketing Service, Transportation and Marketing Programs, Marketing and Transportation Analysis
- USDA publications