by Yeremias Bala Pito Duan, MSF. $4.00
by Prof. Dr. Kees Bertens, MSC $13.00
by Ir. Suprio Guntoro $6.00
by $4.00
by Ir. M. Lies Suprapti $6.00
by Drs. FXS. Purwaharsanto, LIC. I. C. $4.00