na JATIM-06090000010526 20090625111100.0 ind 0010-060900000010526 0 500 DEP l DEPARTEMEN P DAN K 0 Lomba Penelitian Ilmiah Remaja 1986 Cet. 1 Jakarta Balai Pustaka 1989 138 hlm. ; 21 cm 0 0 SAINS JIPDSUR 2 0