by $9.00
by H. Rahmat Rukmana $5.00
by $6.00
by Ir. H. Rahmat Rukmana - Hj. Yuyun Yuniarsih, BSc. $5.00
by Ir. Rabiatual Adawyah, M.P $7.00
by R.P.S. Padmobusono $3.00
by A. W. van den Ban & H. S. Hawkins $12.00