na JATIM-06090000010525 20090625111100.0 ind 0010-060900000010525 0 500 DEP l DEPARTEMEN P DAN K 0 Lomba Penelitian Ilmiah Remaja 1987 Jakarta Balai Pustaka 1989 102 hlm. : ilus. ; 21 cm 0 0 SAINS JIPDSUR 2