Complete the sentence about Kohtla-Järve with the correct year: In ______, the Estonian State Oil Shale Industrial Corporation was formed and extraction by shaft and open-pit mining was extended.
Answer and explanation
Correct answer: B. 1919
In 1919 the Estonian State Oil Shale Industrial Corporation was formed and extraction by shaft and open-pit mining was widened. Mining had begun near Järve village.
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