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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, 1951
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