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- Natural gasoline and cycle plants in the United States, January 1, 1950
- Natural-gasoline and cycle plants in the United States, January 1, 1952
- Natural-gasoline and cycle plants in the United States, January 1, 1954
- Natural-gasoline and cycling plants in the United States, January 1, 1956
- Natural-gasoline and cycling plants in the United States, January 1, 1958