Lives of the Saints by Alban Butler.
Our Birthday Bouquet Culled from the Shrines of the Saints and the Gardens of the Poets by Eleanor C. Donnelly.
Pictorial Half Hours with the Saints by Auguste François Lecanu.
Gregory the Great, Dialogues (search for additional references)
Art & Architecture
Emblems of Saints by Which They Are Distinguished in Works of Art by F. C. Husenbeth.