Boring at Hikoshima. 1920s Japan, public domain image.

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Boring at Hikoshima. 1920s Japan, public domain image.

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Summary

日本語: 関門トンネル建設のための彦島における地質調査ボーリング作業English: Drilling survey of geological condition at Hikoshima for construction of Kammon railway tunnel

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Date

1927
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Wikimedia Commons
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public domain

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