by Ir. Abbas Siregar Djarijah & Ir. Harsono Puspowardoyo
$6.00

by Stefan Leks
$3.00

by Ir. Hieronymus Budi Santoso
$5.00

by Ir. Sudadi Martodireso & Ir. Widada Agus Suryanto, MM
$6.00

by J. Waskito, SJ.
$12.00

by Dr. Nico Syukur Dister, OFM.
$6.00