Voice of America archive of articles featuring TNKR:
https://www.voakorea.com/korea/korea-social-issues/tnkr-volunteer
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https://www.voanews.com/east-asia-pacific/north-korean-defectors-find-political-voice-south
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https://www.voakorea.com/korea/korea-social-issues/4883387
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Other times TNKR has been mentioned in passing