1. Letter from Maxine Singer to Leon A. Heppel

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2. Letter from Leon A. Heppel to Maxine Singer

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3. Letter from Leon A. Heppel to Maxine Singer

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4. Letter from Severo Ochoa to Maxine Singer

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5. Letter from Leon A. Heppel to Maxine Singer

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6. Phosphorolysis of Oligoribonucleotides by Polynucleotide Phosphorylase

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7. Excerpt from Volume 6 of Singer's lab notebooks

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8. Letter from Severo Ochoa to Maxine Singer

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9. Letter from Maxine Singer to Severo Ochoa

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10. Letter from Leon A. Heppel to Maxine Singer

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11. Letter from Leon A. Heppel to Maxine Singer

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12. Letter from Marianne Grunberg-Manago to Maxine Singer

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13. Letter from Marianne Grunberg-Manago to Maxine Singer

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14. Letter from Maxine Singer to Paul Berg

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15. The Mechanism of Action of Polynucleotide Phosphorylase

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16. Letter from Maxine Singer to Marianne Grunberg-Manago

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17. Letter from Maxine Singer to Severo Ochoa

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18. The Polymerization of Guanosine Diphosphate by Polynucleotide Phosphorylase

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19. Memorandum from Maxine Singer to DeWitt Stetten, Jr

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20. Letter from Maxine Singer to Faith N. Brenneman

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