by Ir. Abbas Siregar Djarijah & Ir. Harsono Puspowardoyo
$5.00

by Ir. Hatta Sunanta, B.Sc., MS
$7.00

by Ir. M. Lies Suprapti
$6.00

by A. Widyamartaya, B.A
$3.00

by J. Donald Walters
$5.00

by WK
$12.00