Maldwyn Jones, Henry Steele Commager and Marcus Cunliffe (eds.), The American Destiny: an Illustrated Bicentennial History of the United States (20 vols., 1976)
Articles
"From the Old Country to the New: The Welsh in nineteenth-century America", Flintshire Historical Society Publications, 27 (1975–76): 85–100.
"The background to emigration from Great Britain in the nineteenth century". In Donald Fleming and Bernard Bailyn (eds.), Dislocation and Emigration: The Social Background of American Immigration, pp. 3–92 (Cambridge, MA, 1973)
"Ulster emigration, 1783—1815". In E. R. R. Green (ed.), Essays in Scotch-Irish History (London:
Routledge, 1969)
"The Scotch-Irish in British America". In Bernard Bailyn and Philip D. Morgan (eds.), Strangers within the Realm: Cultural Margins of the First British Empire (
Chapel Hill:
University of North Carolina Press, 1991)