by Purbowaseso, Bambang $7.00
by Ir. F.X. Susanto Tumpal HS. Siregar $5.00
by Hendrik Peters, Jan $6.00
by A. W. van den Ban & H. S. Hawkins $12.00
by Ir. Juhaeni Radi $5.00
by Andang Priadi S. M $5.00