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863. Letter from Francis Crick to Georg Kreisel

864. Letter from Francis Crick to Georg Kreisel

865. Letter from Francis Crick to Georg Kreisel

866. The Genetic Code for Proteins

867. Letter from Francis Crick to Francois Jacob

868. Letter from Francois Jacob to Francis Crick

869. Letter from Vernon M. Ingram to Francis Crick

870. Letter from Francis Crick to Vernon M. Ingram