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From Oswald Heer 23 March 1875
Summary
Discusses his work [Flora fossilis Arctica, vol. 4, pt 1 (1876)].
Sends copy of [Fossile Pflanzen von Sumatra (1874)]. Comments on climate in Tertiary period, especially on Sumatra.
Comments on theory of Thomas Belt concerning climatic change in ice age.
| Author: | Oswald Heer |
| Addressee: | Charles Robert Darwin |
| Date: | 23 Mar 1875 |
| Classmark: | DAR 166: 131 |
| Letter no: | DCP-LETT-9901 |
