Columbia subject headings:
Harvard subject headings:
Abbaye des Maçons de Fribourg--History.
Guilds--Switzerland--Fribourg--History.
Stonemasons--Switzerland--Fribourg--History.
Princeton subject headings:
Abbaye des Maçons de Fribourg--History.
Guilds--Switzerland--Fribourg--History.
Stonemasons--Switzerland--Fribourg--History.