Columbia subject headings:
Blondel, Maurice, 1861-1949--Congresses.
Harvard subject headings:
Blondel, Maurice, 1861-1949--Congresses.
Blondel, Maurice, 1861-1949. L'action--Congresses.
Philosophy, Modern--20th century--Congresses.
Princeton subject headings:
Act (Philosophy)--Congresses.
Blondel, Maurice, 1861-1949--Criticism and interpretation--Congresses.