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2018
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DOAB Directory of Open Access Books
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Springer Nature Link eBooks - Fully Open Access
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DOAB Directory of Open Access Books
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Taylor & Francis eBooks (Open Access)
2018
ScienceDirect
2017
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2020
DOAB Directory of Open Access Books
2020
DOAB Directory of Open Access Books
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DOAB Directory of Open Access Books
2016
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2016
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2016
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2016
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2016
DOAB Directory of Open Access Books
2012