na INLIS000000000003577 20150116131238.0 a ||| | 170609| ||| | $a 0010-011500000001580 $a 574 $a Depdikbud $a Ilmu pengetahuan alam $b Problematika $a Jakarta $b Dewi hutam citra $c 1998 $a 7496/bpu/2000