by Sei H. Dt. Tombak Alam $6.00
by L. Prasetya, Pr. $4.00
by Ir. H. Rahmat Rukmana $5.00
by Y. Dedy Pradipto $11.00
by Yusuf Abdullah Daghfag $6.00
by Ir. L. Widarto & FX. Sudarto C. Ph $5.00
by Ir. H. Djoko Tribawono, M.Si. $6.00