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1. HTML metadata is pointless, because there aren't any apps that actually read them; metadata should only be defined in the .opf file.
2. All your entries are missing the final slash or a closing </meta> tag:
<meta content="2016/05/19" name="dcterms.date.of.publication" />
or
<meta content="2016/05/19" name="dcterms.date.of.publication"></meta>
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