Horváth Géza (szerk.): A Magyar Természettudományi Múzeum évkönyve 18. (Budapest 1921)

Éhik, Gy.: The glacial-theories in the light of biological investigation

THE GLACIALrTHEORIES. 91 Fig. 1. Zoogeographical map of Europe in the Pliocene. (Orig.) (In figs. 1—5: — 1. The Polare ice; — 2. Subarctic biosphere; — 3. Thermophil biosphere ; — 4. Tropical biosphere ; — 5. The steppe zone ; — 6. The forest of deciduous leaved trees ; — 7. Coniferous forest formation.)