by Ir. G. Djatmiko Sudarmo & Ir. S. J. Edy Purnomo $12.00
by F.W. Dillistone $9.00
by Agung Kristiawan $9.00
by Al. Wahjasudibja, Pr. $10.00
by J. Donald Walters $5.00
by Ir. Abbas Siregar Djarijah $5.00