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3. Hallworth J . ‘County lines’: an exploratory analysis of migrating drug gang offenders in North Essex. Masters degree in applied criminology and police management. 2016. http://www.crim.cam.ac.uk/alumni/theses/John%20Hallworth.pdf (Accessed 14 May 2018).
4. National Crime Agency publication. County lines gang violence exploitation and drug supply. 2016. http://www.nationalcrimeagency.gov.uk/publications/753-county-lines-gang-violence-exploitation-and-drug-supply-2016/file (Accessed 14 May 2018).
5. National Crime Agency publication. County lines violence, exploitation and drug supply. 2017. www.nationalcrimeagency.gov.uk%2Fpublications%2F832-county-lines-violence-exploitation-and-drug-supply-2017%2Ffile&usg=AOvVaw1l1eH2uj-iKKGH0im71g9o (Accessed 14 May 2018).