Pebble plus. Mighty machines

Describes how rescue boats and their crews help people in emergency situations.

Describes ambulances and the work of ambulance drivers as they help people in emergencies.

Photographs and simple test in English and Spanish describe military helicopters, their parts, and their crews.

A simple, photographic introduction to submarines, explaining what they are, examining the different parts of a submarine, and discussing what subs do.

Photographs and simple text describe various farm tractors, their parts, and what they do.

Text and photographs introduce cranes, truck cranes, and tower cranes and how they life and raise loads high into the air.

Simple text and photographs describe tow trucks, their parts, and their jobs.