24 May – Saint Donatian and Saint Rogatian

Martyre des Enfants-Nantais by Théophile-Auguste Vauchelet
Saint Donatien et Saint Rogatien
Libro del Compendio della vita dei santi
The Book of Saints

Modern Hagiography

Roman Martyrology

Sanctorale Catholicum

Lives of the Saints by Alban Butler.

Pictorial Lives of the Saints 

Pictorial Half Hours with the Saints by Auguste François Lecanu.

La vie des saints

Medieval Hagiography

BHL, Supplement

Acta Sanctorum

The Cult of Saints in Late Antiquity Database

Art & Architecture

POP : la plateforme ouverte du patrimoine

24 May – Our Lady Help of Christians

Tommaso Andrea Lorenzone (1824-1902), at the request of Don Bosco

Modern Mariology

The Liturgical Year by Dom Guéranger.

Character Calendar 

Our Birthday Bouquet Culled from the Shrines of the Saints and the Gardens of the Poets by Eleanor C. Donnelly.

La vie des saints

The Fairest Flower of Paradise: Considerations on the Litany of the Blessed Virgin, Enriched with Examples Drawn from the Lives of the Saints by Alexis Lepicier.

Legends of the Blessed Virgin by Jacques-Albin-Simon Collin de Plancy.

Tradition in Action

Wikipedia

Art & Architecture

Mary Help of Christians in the Basilica of Our Lady Help of Christians, Turin

Abbey Basilica of Mary Help of Christians

Music

Hymn to Our Lady Help of Christians

Songs for Catholic Schools

Prayers

Prayers to Our Lady Help of Christians in the Raccolta

Prayer to Mary Help of Christians

Prayer to Our Lady, Help of Christians