encyclopedias

This book presents accounts of experiences, or perceived experiences, of encounters with extraterrestrials or otherworldly beings.

This encyclopedia, alphabetically organized, introduces the world of science, including fact boxes, vocabulary panels, experiments, and puzzles.

This book, with its hundreds of maps, tables, charts, and photographs, presents articles on the history of each African nation and every major cultural, religious, and political movement in Africa and the New World.

A ten volume encyclopedia covering a variety of topics in science, technology and engineering. Includes experiments.

The set consists of a single alphabetic arrangement of entries ranging from cross-cultural topics such as games or pyramids to studies of specific civilizations places, as well as biographies of people, legendary figures, and deities.