See this legally free ebook:
- Devotion to the Nine Choirs of Holy Angels, and especially to the Angel-Guardians, by Henri-Marie Boudon, translated by Edward Healy Thompson (London: Burns, Oates & Co.; Dublin: Kelly, 1869). Available in multiple formats at Internet Archive. Also available in PDF format (on this page) of The Catholic Kingdom’s library, and in PDF format (on this page) of Saints’ Books.
On the Memorial of the Holy Archangels Michael, Gabriel, and Raphael in the Ordinary Form of the Roman Rite. For more legally free ebooks, you may access the List of Free eBooks (Arranged by Title) and the List of Free eBooks (Grouped by Subject). Blessed be God in His angels and in His saints!