Finding-out books

A discussion of gravitational, centrifugal, and magnetic forces--what they are and do and how they are applied.

Traces the development of cities throughout history, with emphasis on cities in the United States and discussions of ways to solve modern urban problems.

An easy-to-read discussion of how living things inherit traits and the influence of environment upon heredity.

Discusses sightings of flying saucers and other unidentified flying objects and possible explanations of these phenomena.

Defines gravity and magnetism and how they function.

Discusses the development of the Constitution after the Revolutionary War and the evolution of its amendments as changing times produced a need for them.