Columbia subject headings:
Harvard subject headings:
Public spaces--United States--History--19th century.
Public spaces--United States--History--20th century.
Technology and civilization
Technology in literature.
Technology--Social aspects--United States--History
United States--Civilization--19th century.
United States--Civilization--20th century.
Princeton subject headings:
Public spaces--United States--History--19th century.
Public spaces--United States--History--20th century.
Technology and civilization.
Technology in literature.
Technology--Social aspects--United States--History.
United States--Civilization--19th century.
United States--Civilization--20th century.