by Bambang Agus Murtidjo $6.00
by Dr. A. Supratiknya $6.00
by Ir. Bambang Cahyono $7.00
by Ir. Setijo Pitojo $6.00
by Ir. Heinz Frick $5.00
by Dr. Al. Purwa Hadiwardoyo, MSF. $4.00