Historic CH₄ records from Antarctic and Greenland ice cores, Antarctic firn data, and archived air samples from Cape Grim, Tasmania - D.M. Etheridge, L.P. Steele, R.J. Francey, and R.L. Langenfelds

Atmospheric CH₄ Concentrations from the CSIRO GASLAB Flask Sampling Network - L.P. Steele, P.B. Krummel, and R.L. Langenfelds

1/2003