by P. Efrem Zuba, CSsR. $3.00
by Ir. Bambang Cahyono $7.00
by Suryohadiprojo, Sayidiman $7.00
by Dr. B.S. Mardiatmadja $6.00
by Dr. Dimyati dan Drs, Mudjiono $9.00
by Ir. M. Lies Suprapti $6.00