1. Sputnik + 30

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2. Memo to file

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3. The Prospects for Life on Mars: A Pre-Viking Assessment

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4. The Viking Biological Investigation: Preliminary Results

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5. The Viking Mission Search for Life on Mars

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6. Letter from Joshua Lederberg to Salvador E. Luria

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7. Exobiology: Approaches to Life Beyond the Earth

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8. Multivator: A Biochemical Laboratory for Martian Experiments

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9. Relationship of Planetary Quarantine to Biological Search Strategy

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10. Mars Through A Crystal Ball

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11. Microenvironments for Life on Mars

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12. Signs of Life: Criterion System of Exobiology

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13. Contamination of Mars

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14. What Do We Seek in Space?

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15. Life Beyond the Earth

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