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A foundered Victorian ship looking for the fabled Northwest Passage holds a secret in its icy grave... When Dirk Pitt of NUMAr is almost blown to pieces in a lab explosion, he suspects sabotage. The lab in question belongs to a scientist hoping to use a rare mineral to combat greenhouse gases - but who would want to destroy our one chance to save the planet? However, there are those who will do anything to control such a valuable prize. Pitt's investigations take him to the Arctic in search of a clue to the origins of this precious mineral. There he and NUMAr colleague Al Giordino must battle ...

Historia es un volumen dedicado al mundo anterior al que hemos conocido, desde la época de los dinosaurios, hasta los primeros hombres primitivos, el antiguo Egipto, los grandes imperios de Grecia, Roma y China, la Edad Media, etc. Incluye ejercicios de atención y vocabulario específico.

The skeletal system is made up of bones. They support and protect your body and help it work. Some bones help you run, or pick up a pencil; others protect organs, like the skull, which protects your brain. Learn about bones, joints and more in this informative book.

Objetivos: Adquirir los conocimientos básicos para poder plantear instalaciones de tuberías. Estudiar las herramientas de medición y de nivelación, las técnicas de sujeción de tuberías y los procedimientos adecuados para colocarlas