Columbia subject headings:
Oil industries--Environmental aspects--South Dakota.
Oil spills and wildlife--Environmental aspects--South Dakota.
Petroleum industry and trade--Environmental aspects--South Dakota.
Petroleum waste--Environmental aspects--South Dakota.
Water quality--South Dakota.
Harvard subject headings:
Oil industries--Environmental aspects--South Dakota--Western area.
Oil spills and wildlife--Environmental aspects--South Dakota--Western area.
Petroleum industry and trade--Environmental aspects--South Dakota--Western area.
Petroleum waste--Environmental aspects--South Dakota--Western area.
Water quality--Environmental aspects--South Dakota--Western area.
Princeton subject headings:
Oil industries--Environmental aspects--South Dakota.
Oil spills and wildlife--Environmental aspects--South Dakota.
Petroleum industry and trade--Environmental aspects--South Dakota.
Petroleum waste--Environmental aspects--South Dakota.
Water quality--South Dakota.