Columbia subject headings:
Anarchists--Spain--Biography.
Ferrer i Farriol, Joan, 1896-1978.
Labor unions--Spain--Biography.
Harvard subject headings:
Anarchists--Spain--Biography
Ferrer i Farriol, Joan, 1896-
Labor unions--Spain--Biography.
Princeton subject headings:
Anarchists--Spain--Biography.
Ferrer i Farriol, Joan, 1896-1978.
Labor unions--Spain--Biography.