by A. Lukasik, SCI. $4.00
by Frank G. Goble $9.00
by Dr. Ir. Muhammad Rasyaf, MS $7.00
by Dr. H. Pidyarto Gunawan, O.Carm $4.00
by H. Rahmat Rukmana $5.00
by Suharso, A.S.P $6.00