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Authors whose works are in public domain in at least one jurisdiction

List of works by David Harper

International Chronostratigraphic Chart 2016/10 ⬇️

2016 English-language edition of the international chronostratigraphic visualization

International Chronostratigraphic Chart 2017/02 ⬇️

2017 English-language edition of the international chronostratigraphic visualization

International Chronostratigraphic Chart 2018/08 ⬇️

2018 English-language edition of the international chronostratigraphic visualization

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