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HARVARD Citation
Gradstein, F. et al. (eds.) (2020) Geologic time scale 2020. [Online]. Amsterdam, Netherlands : Elsevier. Available from: http://access.bl.uk/ark:/81055/vdc_100110517361.0x000001
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Gradstein, F. et al. (eds.) (2020) Geologic time scale 2020. [Online]. Amsterdam, Netherlands : Elsevier. Available from: http://access.bl.uk/ark:/81055/vdc_100110517361.0x000001