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Twelve Volume Reference for beginning chemistry students.

Depicts flags of all the countries in the world. Includes locator maps, fact boxes, descriptions, and a summary of flag sources, colors, and iconography.

Examines extinct species, including prehistoric man, and discusses why extinction happens, as well as how information is gathered on species that existed before humans evolved.

Examines extinct species, including prehistoric man, and discusses why extinction happens, as well as how information is gathered on species that existed before humans evolved.

Presents information about the lives and works of 250 writers of works for young people.

Examines extinct species, including prehistoric man, and discusses why extinction happens, as well as how information is gathered on species that existed before humans evolved.

Examines extinct species, including prehistoric man, and discusses why extinction happens, as well as how information is gathered on species that existed before humans evolved.