540 Chemistry and allied sciences
540.92 Chemists vi
540 Hoá học và khoa học liên quan
540.92 Nhà hoá học it
540 Chimica e scienze connesse
540.92 Chimici en
540.9 Chemistry--history
540.92 Chemists de
540.9 Chemie—Geschichte
540.92 Chemiker
Dewey Decimal Classification
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