Amst., 1930. 30 pp. [35] b./w. ills. Orig. wrappers. (Wendingen vol. 11, no. 2). - - Copy without the advertisements; cover sl. foxed. Le Coultre, pp. 228-229. *Lithogaphed cover after a design by L.C. van der Vlugt. - - This copy has the (original) light-blue/blue cover.