Usefulref.com : Subject Index : Business Studies

General business articles on currencies, economics, companies and current business news.

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Usefulref.com : Subject Index : Mathematics

General mathematics topics on the study of numbers and their operations, interrelations, combinations, generalizations, and abstractions and of space configurations and their structure, etc.

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Astronomy

Astronomy is the scientific study of celestial objects (such as stars, planets, comets, and galaxies) and phenomena that originate outside the Earth's atmosphere the formation and of the universe.

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