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I may need further research but, according to article introduced in a local journal of 1909, Japanese knew there was a hopeful oil field in North Sakhalin in the early 20th century and confirmed it during the Ruso-Japanese War. However, It was not in time for the immediate demands for the war in China because of the harsh natural environment for mining beside it belonged to Russia.If Japan knew that there was oil in the Sakhalin Islands, that whole southern expansion might not have happened.
Is it me, or am I Turning Japanese, I'm turning Japanese, oh yes I think so!!!!!!!!!!!!!!!!!!!I may need further research but, according to article introduced in a local journal of 1909, Japanese knew there was a hopeful oil field in North Sakhalin in the early 20th century and confirmed it during the Ruso-Japanese War. However, It was not in time for the immediate demands for the war in China because of the harsh natural environment for mining beside it belonged to Russia.
Oil in Sakhalin (Oil Journal in 1909)
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Wow Paul, that's great I have just added a few of those to my pile too...!