Artists--Pennsylvania--Philadelphia--20th century 1 California--Description and travel--19th Century 1 International trade--18th century 1 International trade--19th century 1 Lehigh University (Pa.)--20th century 1 Northern Pacific Railroad 1 Outdoor sculpture--United States 1 more ... Panama Canal 1 Panama--Description and travel--19th century 1 Panama--History--19th century 1 Panama-Pacific International Exposition (1915 : San Francisco, Calif.) 1 Public sculpture, American--20th century 1 Railroad engineering 1 Russia and Far East--Diplomatic relations--20th century 1 Union Pacific Railroad Company 1 United States--History--Civil War, 1861-1865--Homefront 1 United States--History--Civil War, 1861-1865--Personal Correspondence 1 less ...