The Withers-Davis Ancestry covers a large concentration of families from the area of Chester and Delaware counties, Pennsylvania; New Castle co, Delaware; New England; co. Wilts, England; and co. Glamorgan and surrounding areas of Wales. Many though by no means all of the families were Quaker. Coverage in America is particularly heavy in the 1600s and 1700s, making the book indispensable to those seeking their colonial roots. Other names, areas, and periods are also represented.