by Ir. F.X. Susanto Tumpal HS. Siregar $5.00
by Dr. Ibrahim Madkour $11.00
by Ir. Mul Muyani Sutedjo $7.00
by Sridadi & Rachmanto $6.00
by $13.00
by Ir. Setijo Pitojo $7.00
by Asril Sitompul, S.H. $7.00
by $11.00
by Ir. Suharto $7.00
by Prof. Dr. Sondang P. Siagian, M.P.A $7.00
by - $7.00
by R. Soeroso, S. H. $9.00