The concentration and isotopic abundances of carbon dioxide in rural and marine air

Craig, 1954, Carbon-13 in plants and the relationship between carbon-13 and carbon-14 variations in nature, J. Geol., 62, 115, 10.1086/626141

Craig, 1957, Isotopic standards for carbon and oxygen and correction factors for massspectrometric analysis of carbon dioxide, Geochim. et Cosmochim. Acta, 12, 133, 10.1016/0016-7037(57)90024-8

Epstein, 1953, Variations of O18 content of waters from natural sources, Geochim. et Cosmochim. Acta, 4, 213, 10.1016/0016-7037(53)90051-9

Keeling, 1958, The concentration and isotopic abundances of carbon dioxide in rural areas, Geochim. et Cosmochim. Acta, 13, 322, 10.1016/0016-7037(58)90033-4

Keeling, 1961, A mechanism for cyclic enrichment of carbon-12 by terrestrial plants, Geochim. et Cosmochim. Acta., 24, 299, 10.1016/0016-7037(61)90024-2

McKinney, 1950, Improvements in mass spectrometers for the measurement of small differences in isotope abundance ratios, Rev. Sci. Instrum., 21, 724, 10.1063/1.1745698

Urey, 1947, The thermodynamic properties of isotopic substances, J. Chem. Soc., 562, 10.1039/jr9470000562

Wickman, 1952, Variations in the relative abundance of the carbon isotopes in plants, Geochim. et Cosmochim. Acta, 2, 243, 10.1016/0016-7037(52)90018-5

Worthing, 1943