In html-files for SL 6.4 (sl-release-notes-6.4.html,
Technical.Notes.64.html, Release.Notes.64.html) should be reasonable to
add

<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

Because some unicode characters displayed incorrectly, for example:
© ® — 

In sl-release-notes-6.4.html should be 

<H1>Scientific Linux 6.4</H1>

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Best regards,
Elena