'CORAL REEFS 1. Maps' Maps, graphs, calculations, notes on the literature (especially articles by Dorothy Hill), some dated 1961 Correspondence: Dorothy Hill, April-June 1960 (NB the tone of this correspondence, and the fact that CL Forbes suggested to Blackett in January 1960 that he should write to D Hill, do not suggest that they were already acquainted. See Bernard Lovell, 'P.M.S. Blackett: A Biographical Memoir', Royal Society: 1976, p.92n) Colin L Forbes (data for paper, comments on first draft, new data to be included in second draft) January 1960-February 1961. 1961