La tierra y la importancia del agua

Esta cuarta edición expone los fundamentos de las señales y sistemas discretos en el tiempo y procesamiento digital de señales. Este texto es adecuado para estudiantes de Ingeniería eléctrica, ingeniería informática y Ciencia de la computación.

Early readers learn how to make healthy choices in this Spanish-translated nonfiction introduction to nutrition and eating right. Featuring vivid, colorful photos and simple, informational text, this book teaches children the benefits of healthy eating and encouraged to make healthy decisions.

Alexander Graham Bell was always trying to invent new things! In this biography that has been translated into Spanish, readers will learn about Alexander's life as a teacher and inventor of such incredible inventions as the telephone, record player, and metal detector. Colorful images, supportive text, an interesting timeline, and a helpful glossary, table of contents, and index combine to give readers an inspiring look into the life of Alexander Bell. This 6-Pack includes six copies of this title and a lesson plan.

Describes the physical characteristics, habitats, life cycle, and behavior of different kinds of reptiles, including alligators, turtles, snakes, and lizards.