DOAB Directory of Open Access Books
2021
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2024
DOAB Directory of Open Access Books
1993
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2022
DOAB Directory of Open Access Books
2017
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2013
DOAB Directory of Open Access Books
2025
DOAB Directory of Open Access Books
2007
DOAB Directory of Open Access Books
2006
EBSCO Open Access Journals
2018-01-01 ~ 현재