How Do You Measure Time?

Provides an overview of the design, uses, weapons, and equipment of U.S. Navy submarines. Written in English and Spanish.

Rina Komemoski..., una rana fuera de lo común, aprende el valor de la amistad en medio del hambre implacable... ¿Será posible?

An introduction to ostriches, including their size, diet, and everyday behavior and highlighting differences between those in the wild and those living in zoos.

This complete Spanish translation of the highly acclaimed Isaac Asimov's 21st Century Library of the Universe is ideal for students still developing their English-language skills.

Simple text introduces how different objects move, in different patterns and in different speeds, when pushed or pulled.