Eric Walker added Researchers find just two plague strains wiped out 30%-60% of Europe | Ars Technica to Laishevo and Bubonic plague

Eric Walker added a number of topics to Cities in Russia, and added Cities in Russia to Russia and Cities in Asia

Eric Walker added Researchers find just two plague strains wiped out 30%-60% of Europe | Ars Technica to Laishevo, and added Laishevo to Cities in Russia