http://dewey.info/scheme/a14/ en
520 Astronomy and allied sciences
520.1 Philosophy and theory
http://dewey.info/scheme/a14/ vi
520 Thiên văn học và khoa học liên quan
520.1 Triết học và lý thuyết
http://dewey.info/scheme/a14/ it
520 Astronomia e scienze connesse
520.1 Filosofia e teoria
Dewey Decimal Classification
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