na INLIS000000000024652 Ind 0010-1218006490 Carbon 13 and Carbon 14 in trees and the atmospheric CO2 increase TANS, Petrus Paulus door Petrus Paulus TAns Groningen Veenstra Visser 1978 97 p. : ill. ; 23 cm. 97 p. : ill. ; 23 cm. 581.13TANc Thesis(Doctor)-Rijks Universiteit te Groningen, 1978 581.13 RADIOCARBON DATING ATMOSPHERE CARBON DIOXIDE 542/79-mfn26507