Columbia subject headings:
Authors, Austrian--20th century--Biography.
Editors--Austria--Biography.
Hakel, Hermann--Friends and associates.
Hakel, Hermann--Knowledge and learning.
Literature.
Harvard subject headings:
Authors, Austrian--20th century--Biography
Editors--Austria--Biography.
Hakel, Hermann--Friends and associates.
Hakel, Hermann--Knowledge--Literature.
Princeton subject headings:
Authors, Austrian--20th century--Biography.
Editors--Austria--Biography.
Hakel, Hermann--Friends and associates.
Hakel, Hermann--Knowledge--Literature.