Modern Hagiography
The Holiness of the Church in the Nineteenth Century: Saintly Men and Women of Our Own Times

Medieval Hagiography
Art & Architecture
Warburg Institute Iconographic Database
Lives and Legends of the English Bishops and Kings, Mediaeval Monks, and Other Later Saints by Mrs. Arthur Bell. (conflating, I believe, Saint Mechtilde of Edelstetten with Saint Mechtilde of Hackeborn, 19 November)
The Saints in Art by Joseph Maria von Radowitz.
Modern Hagiography
A Menology of England and Wales
Memoirs of Missionary Priests – Saint Luke Kirby, Blessed Thomas Cottam, Blessed Lawrence Richardson, Blessed William Filby
Art & Architecture
National Portrait Gallery – Blessed Thomas Cottam