by $16.00
by Ir. Sutaman $6.00
by dr. J.F. Shipley $5.00
by Dr. Ir. Adji Sastrosupadi, MS $11.00
by Ir. Nur Tjahjadi $6.00
by E. Martasudjita, Pr. $4.00
by Sanker, K. Pal & Dwijesh K. Dutta Majumder $7.00
by H. Rahmat Rukmana $6.00