by Drs. P. Sumardji $6.00
by H. R. Kartadisastra $5.00
by Dr. Al. Purwa Hadiwardoyo, MSF. $4.00
by V. Indra Sanjaya, Pr. $4.00
by Ir. Indriyanto $9.00
by Ir. Heinz Frick & Pujo L. Setiawan $7.00