Reconstruction of the carbon isotopic composition of methane over the last 50 yr based on firn air measurements at 11 polar sites
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D. Etheridge | W. Sturges | E. Witrant | J. Schwander | T. Röckmann | T. Blunier | J. Chappellaz | C. V. D. Veen | C. Sapart | P. Sperlich | P. Martinerie | R. Wal | S. Bernard
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