by Ir. Abbas Siregar Djarijah $6.00
by Prof. Dr. Soekartawi $7.00
by Ir. H. Rahmat Rukmana $6.00
by Notodihardjo, Hardjono $6.00
by Ir. Setijo Pitojo $9.00
by Munandar. S.C. Utami $6.00