Columbia subject headings:
Shipwrecks--North Atlantic Ocean.
Titanic (Steamship)
Underwater exploration--North Atlantic Ocean.
Harvard subject headings:
Shipwrecks--North Atlantic Ocean
Titanic (Steamship)
Underwater exploration--North Atlantic Ocean.
Princeton subject headings:
Shipwrecks--North Atlantic Ocean.
Titanic (Steamship)
Underwater exploration--North Atlantic Ocean.