Columbia subject headings:
Harvard subject headings:
Birket-Smith, Frederik, 1880-1952--Library--Catalogs.
Guitar music--Bibliography--Catalogs.
Guitar music--Manuscripts--Catalogs.
Kongelige Bibliotek (Denmark)--Catalogs.
Manuscripts--Denmark--Copenhagen--Catalogs.
Private libraries--Denmark--Catalogs.
Rischel, Thorvald, 1861-1939--Library--Catalogs.
Princeton subject headings:
Birket-Smith, Frederik, 1880-1952--Library--Catalogs.
Guitar music--Bibliography--Catalogs.
Guitar music--Manuscripts--Catalogs.
Kongelige Bibliotek (Denmark)--Catalogs.
Manuscripts--Denmark--Copenhagen--Catalogs.
Rischel, Thorvald, 1861-1939--Library--Catalogs.