1953-54, fellow Guggenheim Foundation, 1960-61, Harvard Center for Study of Liberty, 1960-62, Charles Warren Center, Harvard University, 1969-70, American Council of Learned Societies, 1971-72, senior fellow National Endowment of the Humanities, 1968-69, summer fellow Newberry Libr., 197
1953-54, fellow Guggenheim Foundation, 1960-61, Harvard Center for Study of Liberty, 1960-62, Charles Warren Center, Harvard University, 1969-70, American Council of Learned Societies, 1971-72, senior fellow National Endowment of the Humanities, 1968-69, summer fellow Newberry Libr., 197