Criptología digital (Digital Cryptology)

Discusses the physical characteristics of great white sharks that combine to make them such able predators.

Esta obra reúne textos escritos por Andrés Lira sobre el exilio español y los maestros de ese exilio, como: José Medina Echavarría, José Miranda, Ramón Iglesia, Juan Antonio Ortega y Medina, Eugenio Ímaz y José Gaos, quienes han formado parte tanto de la Universidad Nacional Autónoma de México como de El Colegio de México.

Whose Tail is This? Spanish Edition. Animals’ tails are all different shapes and sizes. Some animals have tails that are wide, or strong, or curly. Some are white, and some have stripes. One tail is very beautiful – which one is it?

Here's another exciting set of sports-themed titles for third- through sixth-grade readers reading at a first-grade level. Help to even out the playing field for your at-risk readers with these sports heroes and hot shots.