Columbia subject headings:
Whitehead, Alfred North, 1861-1947--Congresses.
Harvard subject headings:
Franz Ferdinand, Archduke of Austria, 1863-1914.
Princes--Austria--Biography
Process philosophy--Congresses.
Whitehead, Alfred North, 1861-1947--Congresses.
Princeton subject headings:
Whitehead, Alfred North, 1861-1947--Congresses.