by Ir. Hieronymus Budi Santoso $6.00
by H. Rahmat Rukmana $5.00
by $4.00
by Adelbert Snijders $12.00
by Dr. P. Hardono Hadi $7.00
by Ir. Moehar Daniel, M.S & Ir. Darmawati, M.Sc & Ir. Nieldalina, M.Si $7.00