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• Petroleum refineries, including cracking plants, in the United States, January 1, 1950
• Petroleum refineries, including cracking plants, in the United States, January 1, 1952
• Petroleum refineries, including cracking plants, in the United States, January 1, 1953
• Petroleum refineries, including cracking plants, in the United States, January 1, 1954
• Petroleum refineries, including cracking plants, in the United States, January 1, 1955
• Petroleum refineries, including cracking plants, in the United States, January 1, 1956