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Catholic Encyclopedia: Johann Eck http://www.newadvent.org/cathen/05271b.htm |
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Johann Eck http://www.ccel.org/s/schaff/encyc/encyc04/htm/ii.iii.ii.htm |
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Johann Maier Eck http://52.1911encyclopedia.org/E/EC/ECK_JOHANN_MAIER.htm |