User:Opencooper/The Mysterious Underground Men
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- ja:地底国の怪人
- http://www.samehat.com/2013/01/picturebox-launching-holmberg-edited.html
- http://www.comicsreporter.com/index.php/picturebox_inc_announces_ryan_holmberg_line_ten_cent_manga/
- http://www.tcj.com/seduction-of-the-innocent-hiroshima-1950/
- https://www.pastemagazine.com/articles/2013/12/the-mysterious-underground-men-by-osamu-tezuka.html
- http://www.animenewsnetwork.com/house-of-1000-manga/2014-06-13/ten-cent-manga/.75486
- https://www.newsarama.com/21708-sdcc-2014-2014-eisner-awards-winners-announced.html
- http://www.paulgravett.com/articles/article/top_28_graphic_novels_comics_manga