Library
- Amsterdam : North-Holland Pub. Co. , 1949
- 2 v. in 3. ; 26 cm.
Added t. p. in French. Vol. 2 has imprint : Amsterdam, L. J. Veen. CONTENTS.-v. 1. fasc. 1-2. Proceedings, edited by E. W. Beth and H. J Pos ; J. H. A. Hollak, assistant editor.-v. 2. Philosophical essays o ffered to Congress members by the united philosophical societies in the Netherlands.