- found: His The German idea of freedom, 1957.
- found: His Ideas and events, 1992: CIP t.p. (Leonard Krieger) CIP info. (b. 1918, d. 1990; was at the time of his death univ. prof. emer. in the Dept. of Hist., Univ. of Chicago)
- 1980-07-31: new
- 1991-12-31: revised