On the13C record in tree rings. Part I.13C Variations in northern hemispheric trees during the last 150 years

Tellus ◽  
1979 ◽  
Vol 31 (2) ◽  
pp. 124-137 ◽  
Author(s):  
H. D. Freyer
Nature ◽  
2006 ◽  
Author(s):  
Quirin Schiermeier
Keyword(s):  

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