v. 1. General introduction. Mechanics. Edited by E. J. Dijksterhuis.--v. 2A, v. 2B. Mathematics. Edited by D. J. Struik.--v. 3. Astronomy. Edited by A. Pannekoek. Navigation. Edited by Ernst Crone.--v. 4. The art of war. Edited by W. H. Schukking.--v. 5. Engineering. Edited by R. J. Forbes. Music. Edited by A. D. Fokker. Civic life. Edited by A. Romein-Verschoor
