by Ir. Heinz Frick & Pujo L. Setiawan $7.00
by A. Setiyawan, SJ. $7.00
by Ir. M. Lies Suprapti $7.00
by Ir. Abbas Siregar Djarijah $6.00
by Abul Hamdi $6.00
by Dr. Husein Syahatah $9.00