gras = Texte principal
  Partie, Chap.      gris = Texte de commentaire
1 Obser        (69) | donner en parlant (Geolog. Transact., vol. II, seconde série,
2 Obser        (113)|   Horner sur Bonn. Geolog. Transact., vol. IV, p. 439 ; et pour
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