Richard T. Williams

Excitonic and Photonic Processes in Materials

Human Pharmaceuticals

Transcript tax of Bucks County, Pennsylvania, 1779

Soldiers of the American Revolution

Soldiers of the American Revolution, Philadelphia City, Pennsylvania, including "The Districts"

Soldiers of the American revolution, Northampton County, Pennsylvania, including Lehigh County

Index of Berks County, Pennsylvania

Soldiers of the American Revolution, Bucks County, Pennsylvania

Index of wills and administration records: Northampton County, Pennsylvania, 1752-1850, Lehigh County, Pennsylvania, 1812-1850

Soldiers of the American revolution, Philadelphia County, Pennsylvania, including Montgomery County

Index of wills & estate settlements, Montgomery County, Pennsylvania, 1784-1850

Index of wills and administration records of Delaware County, Pennsylvania, 1789-1850

Index of wills & administration records, Philadelphia, Pennsylvania, 1682-1782

Index of Bucks County, Pennsylvania wills and administration records, 1684 to 1850