Columbia subject headings:
Harvard subject headings:
Industrial relations--New York (State)--New York--History--19th century.
Musical instruments industry--New York (State)--New York--History--19th century.
Piano makers--New York (State)--New York--History--19th century.
Steinway & Sons--History--19th century.
Princeton subject headings:
Industrial relations--New York (State)--New York--History--19th century.
Musical instruments industry--New York (State)--New York--History--19th century.
Piano makers--New York (State)--New York--History--19th century.
Steinway & Sons--History--19th century.