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Books about Gurihiru:
Wolverine #304 "Gurihiru Avengers Art Appreciation Variant" by AARON (2012)
Wiki information Gurihiru:
Gurihiru, aka Illustrator Unit Gurihiru and Gurihiru Studios, is a Japanese illustration team, composed of artists Chifuyu Sasaki and Naoko Kawano. They are based in the city of Sapporo.