"Slavery" is a descriptor in the National Library of Medicine's controlled vocabulary thesaurus,
MeSH (Medical Subject Headings). Descriptors are arranged in a hierarchical structure,
which enables searching at various levels of specificity.
The status or condition of a person over whom any or all of the powers attaching to the right of ownership are exercised. The slave trade is all acts involved in the capture, acquisition or disposal of persons with intent to reduce them to enslavement; all acts involved in the acquisition of enslaved persons with a view to selling or exchanging them; all acts of disposal by sale or exchange of persons acquired with a view to being sold or exchanged, and, in general, every act of trade or transport of slaves. ( from http://www.ohchr.org/Documents/Publications/slaveryen.pdf accessed 10/18/2012)
This graph shows the total number of publications written about "Slavery" by people in this website by year, and whether "Slavery" was a major or minor topic of these publications.
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