Эти цифры приводит W.H.C.Frend, JEH, 55 (2004), 126.
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V.Fiocchi Nicolai, F.Bisconti and D.Mazzoleni, The Christian Catacombs of Rome: History, Decoration, Inscriptions (Regensburg, 1999), 20–22, 35, 151–153. A further good general introduction is J.Stevenson, The Catacombs: Rediscovered Monuments of Early Christianity (London, 1978).