by Eddy Tano, Dipl. Chem. Eng. $9.00
by M. Ghufron H. Kordi K $7.00
by Drs. Ngadijo A.J $6.00
by Eddy Tano, Dipl. Chem. Eng. $7.00
by M. Arthur Gillis $11.00
by Drs. Amin Wijaja Tunggal, M.B.A $6.00