Physical World

by Robert L Ripley

Published 1 February 1991
Presents surprising facts about the world, in such areas as land, water, volcanoes, and rocks.

Mathematics

by Robert L Ripley

Published 1 December 1992

Getting There

by Robert L Ripley

Published 1 February 1991
Presents surprising facts about bicycles, boats, cars, and other forms of transportation.

Hours, Days, and Years

by Robert L Ripley

Published 1 September 1991
Presents surprising facts about time, clocks, and calendars.

Far and Wide

by Robert L Ripley

Published 1 September 1991
Presents surprising facts from far and wide, in such areas as unusual cities, jewels, and inventions.