by Ir. H. Rahmat Rukmana $5.00
by Ir. Rudy Gunawan $6.00
by Ir. Lisdiana Fachruddin $5.00
by Darmawijaya, St., Pr. $3.00
by Anthony T. Padovano, Dr. $6.00
by Amr Abdul Mun\'im Salim $5.00