Declining Trend in the 13C/12C Ratio of Atmospheric Carbon Dioxide from Tree Rings of South African Widdringtonia cedarbergensis

Author： February E.C.   Stock W.D.  

Publisher： Academic Press

ISSN： 0033-5894

Source： Quaternary Research, Vol.52, Iss.2, 1999-09, pp. : 229-236

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