Columbia subject headings:
Harvard subject headings:
Mackinac County (Mich.)--Description and travel.
Mackinac County (Mich.)--History.
Mackinac Region (Mich.)--Description and travel.
Mackinac Region (Mich.)--History.
Princeton subject headings:
Mackinac Region (Mich.)--Description and travel.
Mackinac Region (Mich.)--History.