The third summary contains the thousand sections. The third digit in each three-digit number indicates the section. Thus, 610 is used for general works on medicine and health, 611 for human anatomy, 612 for human physiology, 613 for personal health and safety. Source: https://www.oclc.org/content/dam/oclc/dewey/resources/summaries/deweysummaries.pdf Quick List of Useful DDC Numbers
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