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Davies, Dan Isaac Yr Iaith Gymraeg 1785, 1885, 1985!: Neu, Tair Miliwn O Gymry Dwy-Ieithawg Mewn Can Mlynedd : Cyfres O Lythyrau
 Davies, Dan Isaac Yr Iaith Gymraeg 1785, 1885, 1985!: Neu, Tair Miliwn O Gymry Dwy-Ieithawg Mewn Can Mlynedd : Cyfres O Lythyrau
Currier, Horace True A History of the Allerton Family in the United States, 1585-1885: and a Genealogy of the Descendants of Isaac Allerton, "Mayflower Pilgrim", Plymouth, Mass., 1620
 Currier, Horace True A History of the Allerton Family in the United States, 1585-1885: and a Genealogy of the Descendants of Isaac Allerton, "Mayflower Pilgrim", Plymouth, Mass., 1620
Jackson, Halliday 1817-1887 Proceedings of the Sesqui-centennial Gathering of the Descendants of Isaac and Ann Jackson: at Harmony Grove, Chester Co., Pa., Eighth Month, Twenty-fifth, 1875 : Together With the Family Genealogy
 Jackson, Halliday 1817-1887 Proceedings of the Sesqui-centennial Gathering of the Descendants of Isaac and Ann Jackson: at Harmony Grove, Chester Co., Pa., Eighth Month, Twenty-fifth, 1875 : Together With the Family Genealogy
Jackson, Halliday 1817-1887 Proceedings of the Sesqui-centennial Gathering of the Descendants of Isaac and Ann Jackson: at Harmony Grove, Chester Co., Pa., Eighth Month, Twenty-fifth, 1875 : Together With the Family Genealogy
 Jackson, Halliday 1817-1887 Proceedings of the Sesqui-centennial Gathering of the Descendants of Isaac and Ann Jackson: at Harmony Grove, Chester Co., Pa., Eighth Month, Twenty-fifth, 1875 : Together With the Family Genealogy
Currier, Horace True A History of the Allerton Family in the United States, 1585-1885: and a Genealogy of the Descendants of Isaac Allerton, "Mayflower Pilgrim", Plymouth, Mass., 1620
 Currier, Horace True A History of the Allerton Family in the United States, 1585-1885: and a Genealogy of the Descendants of Isaac Allerton, "Mayflower Pilgrim", Plymouth, Mass., 1620
Allerton, Isaac 1785-1875