Columbia subject headings:
Grethe, Carlos, 1864-1913--Catalogs.
Grethe, Carlos, 1864-1913--Correspondence.
Grethe, Carlos, 1864-1913.
Harvard subject headings:
Grethe, Carlos, 1864-1913--Catalogues raisonnés.
Grethe, Carlos, 1864-1913.
Princeton subject headings:
Catalogs.
Grethe, Carlos, 1864-1913--Catalogs.
Grethe, Carlos, 1864-1913--Correspondence.
Grethe, Carlos, 1864-1913.