by $12.00
by Ir. Abbas Siregar Djarijah $6.00
by Prof. Dr. Suhartono $9.00
by $3.00
by Ir. H. Rahmat Rukmana $5.00
by Paul Vallely (ed) $7.00
by WK $13.00
by Ir. M. Lies Suprapti $6.00