by Marsana Windhu $3.00
by Ir. L. Widarto & FX. Sudarto C. Ph $5.00
by Thomas A. N. S $6.00
by Wolfgang Bock, SJ. $6.00
by Prof. Dr. Kees Bertens, MSC $7.00
by Dr. H. Pidyarto Gunawan, O.Carm $4.00