1899-1979 1907-1977 20thcentury allen american americanliterature architects artists authors biography cityplanners correspondence correspondencereps history historyandcriticism intellectuallife knowledge lewis literatureandtechnology lorenc mumford paul poets segal socialaspects socialreformers technology technologyandcivilizationinliterature technologyeiseley technologytate unitedstates viewsontechnologyandcivilizationmumford william