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Dept. of State
https://www.state.gov/documents/organization/271339.pdf
Congressional Research Service
https://fas.org/sgp/crs/misc/R41878.pdf
The Economic Drivers and Consequences of Sex
Trafficking in the United States
https://iwpr.org/wp-content/uploads/2017/09/B369_Economic-Impacts-of-Sex-Trafficking-BP-3.pdf
Search the DOJ and Dept of State websites for more. Also search InterPol for WW stats.