Columbia subject headings:
Harvard subject headings:
Aircraft accidents--Investigation--Iowa.
Governors--South Dakota--Death.
Mickelson, George S.--Death and burial.
United States. Federal Aviation Administration.
United States. National Transportation Safety Board.
Princeton subject headings:
Aircraft accidents--Iowa--Investigation.
Governors--South Dakota--Death.
Mickelson, George S.--Death and burial.
United States. Federal Aviation Administration
United States. National Transportation Safety Board