by Ir. Eddy Afrianto & Ir. Evi Liviawaty $6.00
by B. U. Hadikusumo $5.00
by Soekartawi $7.00
by $4.00
by H. Rahmat Rukmana $6.00
by Drs. FXS. Purwaharsanto, LIC. I. C. $4.00