by Ir. Abbas Siregar Djarijah & Ir. Harsono Puspowardoyo $6.00
by Lipschutz $13.00
by Petra Widmer & Heinz Frick $5.00
by $3.00
by Bole Malo, Agustinus $5.00
by L. Prasetya, Pr. $6.00
by $5.00
by Ir. Fauziah Muhlisah $6.00
by $9.00
by P.K. Ojong $11.00
by Soedharyo Soimin, S. H. $11.00
by Idris Thaha $11.00