18 1 20 Atom dan Molekul Jilid 13 Drs. Sumadia Additional Author mixed material Mengungkap Rahasia Gas jilid 3 Drs. Sumadia Additional Author mixed material Melihat Kerja Mesin Jilid XV Drs. Sumadia Additional Author mixed material Menyelidiki Cahaya Jilid 12 Drs. Sumadia Additional Author mixed material Mengamati Bangunan Jilid 14 Drs. Sumadia Additional Author mixed material Dunia Tumbuhan Jilid 5 Drs. Sumadia Additional Author mixed material Buku Kunci jilid 20 Drs. Sumadia Additional Author mixed material Berkomunikasi jilid 16 Drs. Sumadia Additional Author mixed material Mengenal Listrik Jilid 10 Drs. Sumadia Additional Author mixed material Menggunakan Energi Jilid 9 Drs. Sumadia Additional Author mixed material Dunia Kita dalam Bahaya jilid 19 Drs. Sumadia Additional Author mixed material Teknologi Antariksa Jilid 18 Drs. Sumadia Additional Author mixed material Binatang dengan Tulang Belakang Jilid 7 Drs. Sumadia Additional Author mixed material Mesin Tubuh Manusia Jilid 8 Drs. Sumadia Additional Author mixed material Planet Bumi Jilid 1 Drs. Sumadia Additional Author mixed material Kekuatan Magnet Jilid 11 Drs. Sumadia Additional Author mixed material Abad Komputer Jilid 17 Drs. Sumadia Additional Author mixed material Binatang tanpa Tulang Belakang Jilid 6 Drs. Sumadia Additional Author mixed material