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Nucleus have simple way to use Google webfont, but without possibility use non-latin fonts
<link href='http://fonts.googleapis.com/css?family=Ledger&subset=latin,cyrillic' rel='stylesheet' type='text/css'>
or
@import url(http://fonts.googleapis.com/css?family=Ledger&subset=latin,cyrillic);
not accept in settings of Nucleus theme