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1421. Letter from Francis Crick to Georg Kreisel

1422. The Genetic Code for Proteins

1423. Letter from Francis Crick to Francois Jacob

1424. Letter from Francois Jacob to Francis Crick

1425. Letter from Vernon M. Ingram to Francis Crick

1426. Letter from Francis Crick to Vernon M. Ingram

1427. Letter from Francis Crick to Vernon M. Ingram

1428. Letter from Vernon M. Ingram to Francis Crick

1429. Letter from Francis Crick to David Harker