Courtship and Marriage--20th century 1 Manufacturing--Philadelphia--20th century 1 New York--Politics and government--19th century 1 Patents--Machinery--20th century 1 Pennsylvania--Politics and government--20th century 1 United States--Politics and government--20th century 1 United States--Presidents--Correspondence--19th century 1 more ... United States--Presidents--Correspondence--20th century 1 less ...