by J. Donald Walters $5.00
by Ir. Rudy Gunawan $6.00
by Dr. Ir. Muhammad Rasyaf, MS $6.00
by Ir. H. Rahmat Rukmana $6.00
by $4.00
by Evelyn L. Billings, Dr $0.00
by J. G. Starke Q. C. $12.00