by Mary Evelyn Tucker & John A. Grim $11.00
by Ir. Eddy Afrianto & Ir. Evi Liviawaty $6.00
by M. Sofyan $5.00
by Drs. P. Sumardji $6.00
by H. Rahmat Rukmana $6.00
by R. S. Stainton $7.00