by I. Bambang Sugiharto & Agus Rachmat W $11.00
by Haryoto $5.00
by Ir. M. Lies Suprapti $6.00
by Al. Wahjasudibja, Pr. $12.00
by Agus S. Gunadi $9.00
by Ir. Abbas Siregar Djarijah $6.00