Letter from Thomas Gold to Dr Philip Abelson, Editor, Science Magazine, 1515 Massachusetts Avenue, N.W., Washington DC Enclosure entitled ; 'Space Flight: Manned or Unmanned?' The enclosed is intended to be published in a general magazine shortly. If Abelson wishes to have anyy of this discussion in 'Science' Gold would of course be glad to contribute a piece. He would slant it more to a scientific audience. 16 July 1971