Colorado Parks & Wildlife Research Library

Simple text and illustrations show how a mother and son cook tomatoes with vinegar and spices to make ketchup.

Presents an introduction to how a pencil is made, in simple text with illustrations, tracing the process by which wood, graphite, clay, metal, and rubber are brought together to create this writing utensil.

An introduction to the big rigs, their history, how they are made and tested, their special features, and their many uses. Includes a glossary of related terms.