Sound and Music

by Mark Pettigrew

Published 31 July 1986

Planet Earth

by Mark Pettigrew

Published 31 July 1986
Traces the history of the Earth, how movements in its surface produce mountains, earthquakes, and volcanoes, and what causes the seasons, tides, and patterns of night and day.

Radiation

by Mark Pettigrew

Published 27 March 1986

Weather

by Mark Pettigrew

Published April 1990