by Dr. Ir. Muhammad Rasyaf, MS $6.00
by AAK $7.00
by Oemarjati, Boen S. & W. Wardhana $6.00
by Kemas Ali Hanafiah $9.00
by Walker, Edward L $6.00
by Ir. Setijo Pitojo $7.00
by Lawrie, R.A $16.00