Volume 1
Scope and Content Note: Includes post cards of Bedford and Loysburg, Pennsylvania; an early history of Loysburg; genealogical data concerning Martin Loy I, Margaretta Hoffman, Martin Loy II, John and Elizabeth Loy Davis, Edward T. Kurtz, David M. Loy, and General William Dickenson; portraits and photographs of family members; correspondence between Martin Loy II and his son, David M. Loy, and between David and his wife, Rebecca; correspondence and notes of Peter S. Loy related to his genealogical research.

Volume 2
Scope and Content Note: Genealogical material related to the Ferguson, Mortimer, Drescher, Baird, Hannan, and Stewart families; correspondence between Ellwood Loy and his father, David M. Loy, and between Ellwood's brother, Peter S. Loy; family correspondence between Peter S. Loy, his wife, and daughters, Charlotte and Annah; correspondence of Peter S. Loy from his grandchildren and from F.E. Wager who describes his covered wagon trip to the Montana gold fields with other residents of De Pere; photographs of Peter S. Loy, his brother, Ellwood, his wife, daughters, grandchildren, and his home in De Pere, Wisconsin and Alhambra, California; notes by Peter S. Loy concerning his contracting work and investments.

Volume 3
Scope and Content Note: Includes family correspondence of Peter Schell, David Loy, Ann Rebecca Loy, Peter S. Loy, and Charlotte Watson Loy; photographs of Peter S. Loy, his home in De Pere, the city of De Pere, and family grave sites; post cards of Green Bay and Appleton, Wisconsin, Bedford, Pennsylvania, and Phoenix, Arizona; newspaper clippings concerning the history of De Pere; papers related to investments of Peter S. Loy; and lists of books and other materials donated by Peter S. Loy to various libraries and to the State Historical Society of Wisconsin.