Authors: BACKMAN, G. --- FODOR, A. --- FREY-WYSSLING, A. --- IVY, A.C. --- Koningsberger, V.J. --- et al. PARKES, A. S. --- Redfield, A.C. --- SLIJPER, E. J. --- Vonk, H. J.
Year: 1948 Publisher: Den Haag : W. Junk,