by Dr. Machasin MA $6.00
by $4.00
by Aloys Budi Purnomo, Pr. $4.00
by Dr. Ir. M. Imadduddin Abdul Rahim, M.Sc $7.00
by Ir. H. Rahmat Rukmana $5.00
by Tardjono Abu M. Muaz $7.00