Letter from Thomas Gold to Dr Phillip Abelson, Editor, Science Magazine, Washington, DC Enclosing a paper submitted for publication as an article in 'Science', 'Lunar and planetary mass concentrations' by B T O'Leary, M J Campbell and C Sagan. Says that the authors of the paper are sending Dr Abelson the enclosed photographs [neither the paper nor the photographs are included with this letter]. 27 November 1968