World War, 1914-1918--Personal Narratives 7 World War, 1914-1918--Personal narratives, American 3 World War, 1914-1918 2 World War, 1914-1918--Participation, American 2 World War, 1914-1918--Personal correspondence 2 American Red Cross--History--20th Century 1 Arts and Antiques--Americana 1 more ... Brothers and sisters--Correspondence 1 Children--Correspondence 1 Correspondence--United States--1910-1920 1 Family life--Personal correspondence--20th century 1 Family life--Upper Class--Philadelphia--19th and 20th centuries 1 Forests and forestry 1 France--Description and Travel--20th century 1 Gibbon, John H. (John Heysham), 1871-1956 1 Gibbon, John Heysham Jr., 1903-1973 1 Gibbon, John, 1827-1896 1 Immigration of African-Americans--18th Century 1 Influenza epidemic, 1918-1919--United States--History 1 Jefferson Medical College--History 1 Law partnerships—Pennsylvania—Philadelphia—20th century 1 Lumber trade--Pennsylvania 1 Military education—United States—20th century 1 Military service, Voluntary 1 Military training camps—United States—20th century 1 Mourning customs—20th century 1 Personal Correspondence 1 Social life and customs--19th century 1 Social life and customs--20th century 1 Soldiers--Pennsylvania--Philadelphia--20th century 1 Soldiers—Diaries—20th century 1 United States Navy--Surgeons 1 United States--History--1913-1921 1 United States--History--Civil War, 1861-1865--Correspondence 1 United States. Army--Military life 1 War widows—Pennsylvania—20th century 1 Wolrd War, 1914-1918--Music and the war 1 World War, 1914-1918--Civilian relief--France 1 World War, 1914-1918--Draft resisters 1 World War, 1914-1918--Economic & industrial aspects--France 1 less ...