Columbia subject headings:
Musicians--Correspondence.
Opera--Mexico.
Opera--New York (State)--New York.
Harvard subject headings:
Autobiographies
Maretzek, Max, 1821-1897
Musicians--Biography
Musicians--Correspondence
Opera--Mexico.
Opera--New York (State)--New York
Princeton subject headings:
Musicians--Correspondence, reminiscences, etc.
Opera--Mexico.
Opera--New York (State)--New York.