World Book`s young scientist. Volume 4., Planet earth. Water.
World Book`s young scientist. Volume 6., Animals without backbones. Animals with backbones.
World Book`s young scientist. Volume 9., Construction. Machines.
World Book`s young scientist. Volume 3., Atoms & molecules. Gases.
World Book`s young scientist. Volume 5., Living world. Plants.
World Book`s young scientist. Volume 8., Energy. Conservation.
World Book`s young scientist. Volume 2., Light & electricity. Magnetic power.
World Book`s young scientist. Volume 1., Space technology. Computers.
World Book`s young scientist. Volume 10., Student guide. Index. /
Childcraft`s whole wide world. /
Pets and other animals. : A supplement to Childcraft - the how and why library.
Veľká kniha otázok a odpovedí. : Vesmír. Svet. Príroda. História. Veda a technika. /
Velká kniha otázek a odpovědí. : Vesmír. Svět. Příroda. Historie. Věda a technika. /
Velká kniha otázok a odpovedí. : Vesmír. Svet. Príroda. História. Veda a technika. /
Childcraft - the how and why library. Volume 6., The green kingdom.
Conquest of the sky. : A supplement to Childcraft - the how and why library.
Mysteries and fantasies. : A supplement to Childcraft - the how and why library.