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keyword: Thema Subject Codes -- Time period qualifiers (3) -- c 1500 onwards to present day (3M) -- 21st century, c 2000 to c 2100 (3MR) -- Early 21st century c 2000 to c 2050 (3MRB) – 2 free books.
These books are included in the Directory of Open Access Books. This means that they have been peer-reviewed and are of interest to scholars.
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