5 books in series

100 Things You Should Know About . . .

100 Things You Should Know About . . . is a 5-book series with 5 released primary works first released in 1992 with contributions by Steve Parker, Fiona MacDonald, Belinda Gallagher, and Jane Walker.

Vikings
100 Things You Should Know About Extreme Earth
100 Facts - Ancient Egypt: Be a Pharaoh for a Day and Visit the Land of Pyramids and Mummies
Bugs
Whales and Dolphins