Beth sydd o dan y gwely? /
Manning, Mick.
Granström, Brita.
Meek, Elin.
Welsh Joint Education Committee.
Llandysul : Gwasg Gomer,
2003.
Ar y clawr = On cover : Taith i'r byd dirgel o dan ein traed.
Addasiad Cymraeg gan = Welsh adaptation by : Elin Meek.
Argraffiad Saesneg gwreiddiol = Original English edition : London : Franklin Watts, 1996.
Earth
Geology