Seri Olimpiade Kimia, Biologi, dan Sains Junior Drs. Valentino Barus text Jakarta PT Lestari Kiranatama 2010 - ii, 62 hlm. : ilus. ; 21 cm. Drs. Valentino Barus Biografi Ilmuwan 925 925 VAL p 978-602-8982-12-2 180925 20180925011947 INLIS000000000000280 Converted from MARCXML to MODS version 3.5 using MARC21slim2MODS3-5.xsl (Revision 1.106 2014/12/19)