by Ir. Bambang Cahyono $7.00
by Pijper, G.F $5.00
by Yoga Aditama, Tjandra $11.00
by Ir. Abbas Siregar Djarijah $5.00
by F. A. Suwandi Wihardjo, B. Sc $6.00
by Kawilarang, Harry $7.00