gras = Texte principal
  Partie, Chap.     gris = Texte de commentaire

1 Obser        (34)|  Lyell a donné une figure (Principles of Geology, livre III, ch.
2 Obser        (73)| fait a été observé (Lyell, Principles of Geology, vol. IV, chap.
3 Obser        (89)|                            Principles of Geology (5e édit.), vol.
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