William Gemmill (1722-1789) and his wife, Jannett, immigrated in 1745 from Scotland to York County, Pennsylvania. He served in both the French and Indian War and the Revolutionary War. Two of his brothers immigrated later. Descendants and relatives lived in Pennsylvania, Ohio, Illinois, Iowa, Kansas, Washington and elsewhere. Other Gemmill family members immigrated from Scotland to Canada, settling in Ontario, Manitoba and elsewhere. Includes notes on ancestry in Scotland and Denmark.

Previously published by Magna Carta, Baltimore. Published as a set by Genealogical Publishing with the two vols. of the Genealogies in the Library of Congress, and the two vols. of the Supplement. Set ISBN is 0806316691.

The Allegheny River flows through the counties of Allegheny, Westmoreland, Armstrong, Clarion, Venango, Forest, and Warren.

Contains checklist of recent additions to the genealogical collections of the Michigan Unit.