The Internet Archive has full-text PDFs of Alban Butler’s twelve-volume set, Lives of the Fathers, Martyrs, and Other Principal Saints (Thomas Richardson, 1842–46):
Butler, Lives
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Hone Your Craft as a Biblical Scholar
The Internet Archive has full-text PDFs of Alban Butler’s twelve-volume set, Lives of the Fathers, Martyrs, and Other Principal Saints (Thomas Richardson, 1842–46):