by E. Martasudjita, Pr. $3.00
by Ir. Suprio Guntoro $5.00
by M. Ghufron H. Kordi K $7.00
by Ir. M. Lies Suprapti $6.00
by $3.00
by Ir. H. Rahmat Rukmana - Hj. Yuyun Yuniarsih, BSc. $6.00