by Ir. M. Lies Suprapti $6.00
by Ir. Abbas Siregar Djarijah $6.00
by Eddy Tano, Dipl. Chem. Eng. $7.00
by WK $12.00
by WK $11.00
by $7.00
by Luqman-nul Hakim , Frans A Djalong , Mohtar Mas’oed $21.00