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Wikipedia:Dewey Decimal System/52
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Dewey Decimal System/52
Dewey Decimal System
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5 Natural Sciences and Mathematics
>
52 Astronomy and Allied Sciences
520 Astronomy and Allied Sciences
521 Celestial mechanics
522 Techniques, equipment, materials[?]
523 Specific celestial bodies and phenomena[?]
524 Not Used
525 Earth[?]
(Astronomical geography)
526 Mathematical geography[?]
527 Celestial navigation[?]
528 Ephemerides[?]
529 Chronology[?]
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