Columbia subject headings:
Bathymetric maps.
Erie, Lake--Maps.
Maps.
Saint Clair, Lake (Mich. and Ont.)--Maps.
Harvard subject headings:
Erie, Lake--Bathymetric maps.
Saint Clair, Lake (Mich. and Ont.)--Bathymetric maps.
Princeton subject headings:
Bathymetric maps.
Lake Erie (Ont.)--Maps.
Maps.