Joseph Clark married Mary Ann Snow in about 1835. They had ten children. He died 25 August 1866. Descendants and relatives lived mainly in Pennsylvania. Includes Gibbons, Ralston, Steen, Young and related families.

Thomas Clark, of Scottish lineage, immigrated from Scotland or Ireland to Cumberland County, Pennsylvania during or before 1750. He served in the French and Indian War, and probably was a colonel during the Revolutionary War. Descendants and relatives lived in Pennsylvania, Ohio, Indiana, Missouri, Kansas, Colorado, Iowa, Wisconsin and related families.

James Clark was born in Dunfermline, County Fife, Scotland in about 1828. He married Sarah Stewart in Lancashire, England in about 1856. They had ten children. James and four of his children emigrated at different times from the 1880s to 1904 and settled in Pennsylvania. Descendants and relatives lived mainly in Pennsylvania, Indiana, Alabama and Arizona.

The bibliographic holdings of family histories at the Library of Congress. Entries are arranged alphabetically of the works of those involved in Genealogy and also items available through the Library of Congress.