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APA Citation
Gradstein, F. M., Ogg, J. G. (. G., Schmitz, M. D., & Ogg, G. (Eds.) (2020). Geologic time scale 2020. Amsterdam, Netherlands : Elsevier. http://access.bl.uk/ark:/81055/vdc_100110517361.0x000001
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Gradstein, F. M., Ogg, J. G. (. G., Schmitz, M. D., & Ogg, G. (Eds.) (2020). Geologic time scale 2020. Amsterdam, Netherlands : Elsevier. http://access.bl.uk/ark:/81055/vdc_100110517361.0x000001