by Istimawan Dipohusodo
$18.00

by Ir. H. Rahmat Rukmana
$6.00

by Dr. Al. Purwa Hadiwardoyo, MSF.
$4.00

by Ir. R. Bambang Soelarso
$6.00

by Dra. V. Nuraini Widjajanti, Apt
$6.00

by Al. Wahjasudibja, Pr.
$3.00