by Dr. Niels Mulder $11.00
by Th. Endang Purwoastuti $6.00
by Ir. Dedy Heryadi Sutisna, MS & Ratno Sutarmanto $6.00
by Ir. Setijo Pitojo $6.00
by E. Martasudjita, Pr. $4.00
by NN $3.00
by Ir. Budi Samadi $6.00