Columbia subject headings:
Harvard subject headings:
35mm cameras--History--20th century.
Businesspeople--Germany--Wetzlar--Biography.
Leica camera--History--20th century.
Leitz, Ernst, 1871-1956.
Microscope industry--Germany--History.
Princeton subject headings:
35mm cameras--History--20th century.
Businesspeople--Germany--Wetzlar--Biography.
Leica camera--History--20th century.
Leitz, Ernst, 1871-1956.
Microscope industry--Germany--History.