| Description | 22 letters; Stockholm, Sweden, 6 Feb 1956-14 Feb 1956; University of Stockholm, Sweden, 6 Aug 1956-24 Apr 1963; University of Ibadan, Nigeria; 6 Jun 1963-24 Jun 1963; Paleontological Institute, Uppsala, Sweden, 18 May 1971 - 14 Jun 1971. For earlier correspondence see Nigeria, Geological Survey, DF100/170/21-22 |