by Isoji, Asoo $6.00
by Heru Susanto $6.00
by Ir. Jumar $9.00
by Swasono, F. Meutia $7.00
by Ir. Hatta Sunanta, B.Sc., MS $5.00
by H. Rahmat Rukmana & Indra Mukti Harahap $5.00
by Abd. Djafar M. Nur $9.00