Columbia subject headings:
Harvard subject headings:
Cunhal, Álvaro
Escapes--Portugal--Peniche.
Fortaleza de Peniche.
Political prisoners--Portugal--Peniche--History--20th century.
Princeton subject headings:
Cunhal, Álvaro.
Escapes--Portugal--Peniche.
Fortaleza de Peniche.
Political prisoners--Portugal--Peniche--History--20th century.