by Marilyn Gustin $6.00
by B. U. Hadikusumo $6.00
by Ir. Hieronymus Budi Santoso $5.00
by H. Rahmat Rukmana $5.00
by Ir. L. Widarto & FX. Sudarto C. Ph $5.00
by Ir. H. Rahmat Rukmana, MBA $5.00