List of people on the postage stamps of Denmark
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Nicolas Steno
Jan Swammerdam
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List of geologists
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List of Danes
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Timeline of geology
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Age of Earth
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Antonie van Leeuwenhoek
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1686
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1638
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X-ray crystallography
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Quartz
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Paleontology
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Ovary
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James Hutton
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January 11
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John Ray
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History of science
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Geologic time scale
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Geology
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Crystallography
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