When Did it Happen?

by Neil Ardley and Lesley Firth

Published 31 May 1985

Who Were They?

by Lesley Firth

Published 27 September 1985

How Does it Work?

by Lesley Firth

Published 31 October 1983

Why is it?

by Lesley Firth

Published 31 October 1983
Provides both short and long answers to hundreds of questions in such areas as biology, physics, transportation, outer space, geology, ethnic customs, history, and sports.

What is it?

by Lesley Firth

Published 25 May 1984