Columbia subject headings:
Belgium--History--German occupation, 1914-1918.
Catholic Church--Political activity.
Mercier, Désiré, 1851-1926.
World War, 1914-1918--Belgium.
World War, 1914-1918--Catholic Church.
Harvard subject headings:
Belgium--History--German occupation, 1914-1918.
Catholic Church--Political activity.
Mercier, Désiré, 1851-1926
World War, 1914-1918--Belgium
World War, 1914-1918--Catholic Church.
World War, 1914-1918--Religious aspects--Catholic Church
Princeton subject headings:
Belgium--History--German occupation, 1914-1918.
Mercier, Désiré, 1851-1926.
World War, 1914-1918--Catholic Church.