World War, 1914-1918--Personal correspondence 2 Brothers and sisters--Correspondence 1 Children--Correspondence 1 Correspondence--United States--1910-1920 1 Family life--Pennsylvania--18th century 1 Family life--Pennsylvania--19th century 1 Family life--Pennsylvania--20th century 1 more ... Family life--Personal correspondence--20th century 1 Gibbon, John H. (John Heysham), 1871-1956 1 Gibbon, John Heysham Jr., 1903-1973 1 Gibbon, John, 1827-1896 1 Influenza epidemic, 1918-1919--United States--History 1 Jefferson Medical College--History 1 Korean War, 1950-1953 1 Personal Correspondence 1 Quakers--Pennsylvania--18th century 1 Social life and customs--20th century 1 Spouses--Correspondence--18th century 1 Spouses--Correspondence--19th century 1 Spouses--Correspondence-–20th century 1 United States--History--Civil War, 1861-1865--Correspondence 1 United States--History--Revolution, 1775-1783 1 World War, 1914-1918 1 World War, 1914-1918--France--Personal accounts 1 World War, 1914-1918--Home front 1 World War, 1914-1918--Hospitals--France 1 World War, 1914-1918--Participation, American 1 World War, 1914-1918--Personal Narratives 1 World War, 1914-1918--Personal narratives, American 1 World War, 1939-1945 1 Young, Samuel Baldwin Marks, 1840-1924 1 less ...