Zim, Herbert Spencer

A guide to mammals of North America that includes a description of each species, a detailed drawing of the animal, and a map locating his common range.

A guide to North American insects which gives popular name, describes life and reproduction cycles and feeding habits, and includes a range guide.

Describes the three types of lifting machines, the jobs they are designed to do, and the duties of the men who operate them.

An introduction to the workings of simple and more sophisticated engines, from the steam engine to the steam turbine, the jet, and the atomic pile. Concepts presented through illustrated diagrams, bold face captions, large print, and small print to assist the youngest reader as well as the adult explaining to the child.