Author
New York State Historical Association
2
O'Connell, Merrilyn Rogers
2
Rath, Frederick L.
2
Franklin Institute (Philadelphia, Pa.) Committee for the Preservation of the Liberty Bell
1
Huth, Hans, 1892-
1
International Centre for the Study of the Preservation and the Restoration of Cultural Property
1
Lord, Clifford Lee, 1912-
1
North American International Regional Conference Williamsburg, Va. and Philadelphia, Pa.)
1
O'Connell, Marrilyn Rogers
1
Pennsylvania Historical Commission
1
Pennsylvania Historical and Museum Commission
1
Pennsylvania. Department of Public Instruction
1
United States. Advisory Council on Historic Preservation. International Centre Committee
1
United States. National Park Service
1