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16. Ingrid U. Olsson (Ed.), Radiocarbon Variations and Absolute Chronology, Proceedings 

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19. G. J. Fergusson, Reduction of Atmospheric Radiocarbon Concentration by Fossil Fuel 

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20. J. C. Lerman, W. G. Mook, and J. C. Vogel, C14 in Tree Rings from Different Localities, 

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