Columbia subject headings:
Authors, German--19th century--Biography.
Gay liberation movement--Germany.
Gay men's writings, German.
Mackay, John Henry, 1864-1933.
Harvard subject headings:
Authors, German--19th century--Biography
Authors, German--20th century--Biography
Gay liberation movement--Germany.
Gay men's writings, German.
Mackay, John Henry, 1864-1933
Princeton subject headings:
Authors, German--19th century--Biography.
Gay liberation movement--Germany.
Gay men's writings, German.
Mackay, John Henry, 1864-1933.