by Ir. L. Widarto $5.00
by Th. Endang Purwoastuti $6.00
by Ir. Hatta Sunanta, B.Sc., MS $6.00
by M. Gani Kristianto $12.00
by A.M. Mangunhardjana, SJ $5.00
by Darmawijaya, St, Pr $6.00
by Ir. Sutaman $6.00