John Satchwell

Energy at work

1981

What Time Is It?

1986

Take away one

1986

Sorting

1989

Water

1985

Water (Energy Today)

1985

Vuur

2004

Time traveller

1985

Shapes

1984

Shapes (Monster Mathematics Books)

1988

Shapes (Early Bird)

1984

Odd one out

1984

Odd One Out (Monster Mathematics Books)

1988

Odd one out (First maths)

1987

Odd One Out (Early Bird)

1984

Message detective

1985

Grande Y Pequeño/Big and Little

1985

Future sources

1981