http://dewey.info/scheme/e22/
600 Technology
600 Technology
600 Technology 601 Philosophy & theory 602 Miscellany 603 Dictionaries & encyclopedias 604 Special topics 605 Serial publications 606 Organizations 607 Education, research & related topics 608 Inventions & patents 609 Historical, geographic & persons treatment
Dewey Decimal Classification: Summaries
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