Columbia subject headings:
National parks and reserves--Michigan.
Pictured Rocks National Lakeshore (Mich.)--Antiquities.
Shipwrecks--Michigan--History--19th century.
Underwater archaeology--Michigan--Pictured Rocks National Lakeshore.
Harvard subject headings:
Excavations (Archaeology)--Michigan--Pictured Rocks National Lakeshore.
Pictured Rocks National Lakeshore (Mich.)--Antiquities.
Shipwrecks--Michigan--Pictured Rocks National Lakeshore--History--19th century.
Underwater archaeology--Michigan--Pictured Rocks National Lakeshore.
Princeton subject headings:
Excavations (Archaeology)--Michigan--Pictured Rocks National Lakeshore.
Pictured Rocks National Lakeshore (Mich.)--Antiquities.
Shipwrecks--Michigan--Pictured Rocks National Lakeshore--History--19th century.
Underwater archaeology--Michigan--Pictured Rocks National Lakeshore.