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871. Letter from Francis Crick to Vernon M. Ingram

872. Letter from Vernon M. Ingram to Francis Crick

873. Letter from Francis Crick to David Harker

877. Letter from Francis Crick to George Gamow

878. Letter from George Gamow to Francis Crick

879. Letter from Francis Crick to Francois Gros

880. Letter from Francois Gros to Francis Crick