Category K - Subheadings /classification Used for taxonomic or other systematic or hierarchical classification systems.
/education Used for education, training programs, and courses in various fields and disciplines, and for training groups of persons.
/history Used for historical aspects in the realm of humanities
/psychology. Used for psychological aspects in the realm of humanities
/trends Used for the manner in which a subject changes, qualitatively or quantitatively, with time, whether past, present, or future.
/statistics & numerical data Used with non-disease headings for the expression of numerical values which describe particular sets or groups of data.
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