Exact Matching Concepts from Other Schemes
- found: Hillis, F. W. A copy of pleasant verses ... 1970.
- found: The Samuel Johnson encyclopedia, 1996 (via Google books, Oct. 23, 2007): p. 17 (group based in New York, known as the Johnsonians, f. 1945)
- 1979-07-02: new
- 2007-10-24: revised