by P. A. Elliot $9.00
by A. Lukasik, SCI. $4.00
by Drs. Ngadijo A.J $6.00
by Drs. Thomas Suyatno, dkk $9.00
by Ir. Hieronymus Budi Santoso $5.00
by $4.00
by ISEI $13.00