Obruchev V.A., Nikiforov P.M., Dvoychenko P.A. i dr. Chernomorskie zemletryaseniya 1927 goda./Obruchev V.A., Nikiforov P.M., Dvoichenko P.A. et al. Black Sea Earthquakes of 1927. In Russian (ask us if in doubt). - landofmagazines.com

TransliterationObruchev V.A., Nikiforov P.M., Dvoychenko P.A. i dr. Chernomorskie zemletryaseniya 1927 goda.

In EnglishObruchev V.A., Nikiforov P.M., Dvoichenko P.A. et al. Black Sea Earthquakes of 1927. In Russian (ask us if in doubt).

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