by Darmawijaya, St., Pr. $3.00
by Ir. M. Lies Suprapti $6.00
by Ir. Hieronymus Budi Santoso $5.00
by Ir. Abbas Siregar Djarijah $6.00
by Drs. Agus M. Hardjana, M.Sc., Ed $3.00
by John Kirvan $6.00