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Narwhals are often called the "unicorns of the sea." But these fascinating creatures are members of the whale family. Read all about narwhals as you practice addition. This Spanish math book combines math and reading skills and uses real-life examples of problem solving to teach subject-area content. The dynamic images, detailed sidebars, practice problems, and math diagrams make learning addition easy and fun. Text features include a table of contents, a glossary, an index, and captions to build vocabulary and increase understanding of math and reading concepts. An in-depth problem-solving...

When President Thomas Jefferson bought the Louisiana Territory from cash-strapped France in 1803, he doubled the size of the United States without really knowing what he was getting. He dispatched Meriwether Lewis and William Clark and their Corps of Discovery to explore a territory that would include part or all of fifteen future states and to seek a water route to the West Coast. Westward expansion began immediately, all for the bargain price of 15 million dollars. This book richly explores this fascinating part of history.

Conmemorar 75 años de El Colegio de México no constituye un logro menor, pero esta efeméride no basta para justificar un recuento de los triunfos alcanzados. Lejos de sucumbir a las trampas de la autocomplacencia, en estas páginas se busca establecer un diálogo crítico con su historia, así como aprobar elementos de inteligibilidad que promuevan un mayor conocimiento y un esfuerzo renovado por ampliar sus perspectivas de estudio. Los ensayos que aquí se reúnen, ideados para revalorar y recuperar las trayectorias de algunos de los primeros protagonistas de esta historia.

Poemas vibrantes de gran romanticismo narran vivencias de un amor sublime que termina con la partida de 'Flor' y la subsiguiente soledad que quebranta al autor. Resalta la sencillez del estilo, su ritmo melodioso y pausado, y el profundo lirismo.