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242. Letter from Francis Crick to Georg Kreisel

243. Letter from Francis Crick to Georg Kreisel

244. Letter from Francis Crick to Georg Kreisel

245. The Genetic Code for Proteins

246. Letter from Francis Crick to Francois Jacob

247. Letter from Francois Jacob to Francis Crick

248. Letter from Vernon M. Ingram to Francis Crick

249. Letter from Francis Crick to Vernon M. Ingram

250. Letter from Francis Crick to Vernon M. Ingram