by H. Rahmat Rukmana $6.00
by Muhammad Chirzin $5.00
by Ir. Abbas Siregar Djarijah & Ir. Harsono Puspowardoyo $6.00
by M. Gani Kristianto $12.00
by Robert W. Crapps $6.00
by Mitra Agro Melodi $9.00