Part 39

Heer, Flore Fossile des Regions Polaires, Zurich; also Bibliotheque Univ. xxxix. p. 12; see also Ann. Nat. Hist. 4th ser. i. 61, iv. 81.

Raulin, Sur les Transformations de la Flore de l'Europe centrale pendant la période Tertiaire.--Ann. des Sc. Nat. 3d ser. Bot. x. 193.

* * * * *

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