Rhys a Chaethwasiaeth Americanaidd', in Canu Caeth: Y Cymry a'r Affro-Americaniaid, ed. Daniel G. Williams (Llandysul: Gwasg Gomer, 2010), 2–25. . E. Wyn James, 'Welsh Ballads and American Slavery', The Welsh Journal of Religious History, 2 (2007), pp. 59–86. ISSN 0967-3938. External links Morgan J. Rhees papers, 1794-1968 at Columbia University http://www.cardiff.ac.uk/special-collections/subject-guides/welsh-ballads/slavery 1760 births 1804 deaths 18th-century Baptist ministers from the United States 18th-century Welsh Baptist ministers People from Caerphilly Religious leaders from Pennsylvania Welsh emigrants to the United States