Earth
6 books
Once a Hero
1992
ISBN 9780748127856
I Wonder Why the Wind Blows and Other Questions About Our Planet
1994
ISBN 9781856972307
Ancient Energies of the Earth
2000
ISBN 9780722538012
Earth - the Power of the Planet
2007
ISBN 9780563539148
Di xin tan xian ji A journey to the center of the earth
2005
ISBN 9787506805520- No cover
Apakah yang membentuk bumi?
1997
ISBN 9789839413106