As you know, I always like to share interesting titles with the NLM readership as I run into them.
A few titles have struck me recently as potentially interesting:
An Abundance of Graces: Reflections on Sacrosanctum Concilium by Pamela Jackson. Published by Hillenbrand Books
Hymn Introits for the Liturgical Year: The Origin and Early Development of the Latin Texts by Christoph Tietze. Published by Hillenbrand Books
Daily Prayer in Christian Spain: a study of the Mozarabic Office by Graham Woolfenden. Published by SPCK
It is also worth noting that Baronius Press has come up with a delightful new series, not specifically liturgical, but made up of some wonderful Catholic books.
These include the Catechism of the Council of Trent, Cardinal Newman's Idea of a University, Robert Hugh Benson's Come Rack Come Rope (which looks at post-reformation English history from a Catholic perspective) and more.