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Books about Karenus:
KARENU The- Saga Gwynn (42) Japanese Language Book by Kaoru Kurimoto (1993)
HAUGTUSSA AND OTHER SONGS/ KATARINA KARENUS by EDVARD HAGERUP GRIEG [Korean Imported] (2008) by EDVARD HAGERUP GRIEG (0100)
Osoku saku no wa karenu hana (Bloom late flowers which is not dead) [JAPANESE EDITION] by Shigeko Ikeda (2014)