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	1.	Impact of fossil fuel emissions on atmospheric radiocarbon and various applications of radiocarbon over this century. [electronic resource] by Graven, Heather D Producer: 20151117 In: Proceedings of the National Academy of Sciences of the United States of America vol. 112 Online resources: Available from publisher's website Availability: No items available. Save to lists Add to cart (remove)
	2.	Atmospheric evidence for a global secular increase in carbon isotopic discrimination of land photosynthesis. [electronic resource] by Keeling, Ralph F Graven, Heather D Welp, Lisa R Resplandy, Laure Bi, Jian Piper, Stephen C Sun, Ying Bollenbacher, Alane Meijer, Harro A J Producer: 20180612 In: Proceedings of the National Academy of Sciences of the United States of America vol. 114 Online resources: Available from publisher's website Availability: No items available. Save to lists Add to cart (remove)

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