La historia de los sistemas numéricos: Valor posicional (The History of Number Systems: Place Value)

This second volume of Obras de teatro infantil presents comedies of love, fear, adventure and absurdity to be read and performed by children both at school and at home.

Este libro recita en versos sencillos las más famosas aventuras de don Quijote. Un libro ideal para primeros lectores que, con la ayuda de los pictogramas, se divertirán leyendo las aventuras de este clásico de la literatura universal.

Illustrations and text present the history, geography, people, politics and government, economy, and social life and customs of Arizona, the Grand Canyon State.

While the Great Depression was indisputably a difficult period in American history, it did lead to certain developments that we still benefit from today. One for the most significant examples of this is Social Security, which helps a whole generation of retired Americans. The book offers a concise description of the Great Depression, including analysis of its causes and its effects. Chapters focus on different aspects of the period, including culture, the arts, and science and technology. The dynamic design displays images of posters and experiences from the Depression era. This informative,...