by G. Siregar, Laksmi $7.00
by Kurtines, William M. & Jacob L. Gerwitz $11.00
by M. Nipan Abdul Hailm & Suharno $6.00
by Ir. Dede Juanda J.S. & Ir. Bambang Cahyono $6.00
by Anggorodi, R $6.00
by Siagian, P. $11.00