Libros de Oceano Group (3 libros)

An illustrated reference furnishes authoritative,objective information on every aspect of human sexuality, covering such topics as the prevention and treatment of sexually transmitted diseases, contraception, sex education, AIDS prevention, and more. (Marriage & Sexuality)

Each encyclopedia in this series is a comprehensive source of information on a Latin American nation.

A definitive overview of the world of mathematics encompasses the fundamental concepts of algebra, geometry, trigonometry, logarithms, statistics, and other mathematical fields, along with hands-on activities, both in the text and on the accompanying CD-ROM, to help readers reinforce their knowledge. (Science & Mathematics)