Columbia subject headings:
Book collecting.
Book collectors--Austria--Biography.
Catalogers--Austria--Biography.
Portheim, Max von, 1857-1937.
Harvard subject headings:
Book collecting--Exhibitions.
Book collectors--Austria--Biography--Exhibitions.
Catalogers--Austria--Biography--Exhibitions.
Portheim, Max von, 1857-1937--Exhibitions.
Princeton subject headings:
Book collecting.
Book collectors--Austria--Biography.
Catalogers--Austria--Biography.
Portheim, Max von, 1857-1937.