7 books in series

Great Mysteries: Opposing Viewpoints

Great Mysteries: Opposing Viewpoints is a 7-book series with 7 released primary works first released in 1987 with contributions by Norma Gaffron, Bryna Stevens, Peter Roop, Connie Roop, Barbara Mitchell, and Clarice Swisher.

The Bermuda Triangle
Poltergeists: Opposing Viewpoints
The Beginning of Language: Opposing Viewpoints
The Pyramids: Opposing Viewpoints
Dinosaurs: Opposing Viewpoints
Witches: Opposing Viewpoints
Bigfoot: Opposing Viewpoints