40 books • 23 series
The Congo (Rivers of the world)
Way People Live (Way Peopl E Live)
Medieval Constantinople (A travel guide to:)
The Ganges (Rivers of the world)
The Nile (Rivers of the world)
The Amazon (Rivers of the world)
Artists of the Renaissance (History Makers)
Jonas Salk (The importance of)
The Galapagos Islands (Endangered animals & habitats)
Hallucinogens (Drug education library)
Cocaine and Crack (Drug education library)
Building the Transcontinental Railroad (World history)
Julius Caesar and Ancient Rome in World History (In World History)
Epics for Students
Palace of Versailles (Building history)
The Golden Gate Bridge (Building America) (Building history)