Robert E. Krebs

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The History and Use of Our Earth's Chemical Elements: A Reference Guide
Krebs, Robert E.

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� 12.10

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Encyclopedia of Scientific Principles, Laws, and Theories: Volume 2: L-Z
Krebs, Robert E.

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� 10.70

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Scientific Laws, Principles, and Theories: A Reference Guide
Krebs, Robert E.

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� 14.47

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The Basics of Earth Science (Basics of the Hard Sciences)
Krebs, Robert E.

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� 20.66

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Groundbreaking Scientific Experiments, Inventions, and Discoveries of the Ancient World
Robert E. Krebs; Carolyn A. Krebs

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� 22.64

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Scientific Development and Misconceptions Through the Ages: A Reference Guide
Robert E. Krebs

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� 21.71

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Encyclopedia of Scientific Principles, Laws, and Theories: Volume 1: A-K (Encyclopedia of Scientific Principles, Laws, and Theories)
Krebs, Robert E.

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� 35.75

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Encyclopedia of Scientific Principles, Laws, and Theories: [2 volumes]
Robert E. Krebs

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� 68.98

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