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Northern Oil Refinery, Alma, MI
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Osceola Refining Company, Reed City, MI
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Osceola Refining Company, West Branch, MI
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Petroleum Specialties, Inc, Flat Rock, MI
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Roosevelt Oil Refinery, Mt. Pleasant, MI
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Secony Mobil Oil Company, Trenton, MI
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Toledo Refining Company, Oregon, OH
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Wolverine Oil Refinery, Alma, MI
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Zephyr Napf-Sol Refining Company, Muskegon, MI
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