by Ir. Abbas Siregar Djarijah $6.00
by Ir. Moehar Daniel, M.S & Ir. Darmawati, M.Sc & Ir. Nieldalina, M.Si $7.00
by AAK (Aksi Agraris Kanisius) $6.00
by H. Rahmat Rukmana $6.00
by Prof. Mr. Roeslan Saleh $5.00
by Ir. A. G. Kartasapoetra $6.00