by H. Rahmat Rukmana $5.00
by H. Rahmat Rukmana $6.00
by Ir. Hieronymus Budi Santoso $5.00
by Yernelis Sukma, M.S., & Yakup $7.00
by Ir. Pracaya $6.00
by Richard G. Lipsey & Peter O. Steiner $16.00