mens en bedrijfsleven Kaderproblemen in het moderne bedrijf / door E.P. Learned, D.N. Ulrich, D.R. Booz ; vert. door P.A. Hermans Explanations and sailing directions to accompany the wind and current charts approved by D.N. Ingraham / M.F. Maury economic and social studies Lessons of the British war economy / ed. by D.N. Chester
