The Catholic Church in Action, by Michael Williams, with the collaboration of Julia Kernan, completely revised by Zsolt Aradi (New York: P.J. Kenedy & Sons, 1958). With Imprimatur. [Link deleted due to copyright concerns.] [N.B. According to the Foreword to the First Edition, this book attempts “to describe briefly and accurately the main outlines of the organized system by means of which the Catholic Church carries on its work in the world today.]
Early steps in the fold: instructions for converts, and enquirers, by Francis M. De Zulueta. Available on Internet Archive
The externals of the Catholic church: her government, ceremonies, festivals, sacramentals, and devotions, by Rev. John Francis Sullivan (New York : P. J. Kenedy & sons, 1917). With Imprimatur. May be read online or downloaded in multiple formats at Internet Archive and Open Library (Digitizing sponsor: MSN, Book contributor: Kelly Library, University of Toronto). The 2nd edition with Imprimatur, revised to conform to the new code of canon law (New York: P. J. Kenedy & sons, 1918), may be read online or downloaded in multiple formats at Open Library.
Guide to a Catholic Church: for non-Catholic visitors; in which the meaning of various objects of devotion is simply explained, and a short exposition given of the main points of Catholic belief, with the prayers of the chief services in Latin and English, by Fox, W. L., O’Gorman, R. A (London : R. & T. Washbourne ; New York : Benziger Bros, 1904). With Imprimatur. Available at Open Library and Internet Archive (Digitizing sponsor: MSN, Book contributor: Regis College Library, University of Toronto).
Indulgences: Their Origin, Nature, and Development, by Alexius M. Lépicier (Alexis-Henri-Marie Cardinal Lépicier), (London : Kegan Paul, Trench, Trübner 1895). With approbation. Available at Open Library. And Internet Archive.
Sacred Signs, by Romano Guardini, translated and with a preface by Grace Branham (St. Louis, Mo.: Pio Decimo Press, 1956). With Imprimatur. A reprint by Fr. Peter Kwasniewski (CreateSpace Independent Publishing Platform, 2015) may be purchased at comand Amazon.de. Sections from the book entitled “Evening” and “Kneeling” may be read at the New Liturgical Movement.
The Splendour of the Liturgy, 2nd edition, by Maurice Zundel (New York: Sheed & Ward, 1944). With Imprimatur. May be purchased at Amazon.com. Reprints are also available at Amazon.com (Forgotten Books, 2018) and Amazon.com (CreateSpace, 2012).
A treatise on indulgences, by Jean Baptiste Bouvier, translated and with a preface by Rev. Frederick Oakeley (London : James Burns, 1848). Available in various formats at Open Library and, in fewer formats, at Internet Archive (Digitizing sponsor: National Institute for Newman Studies, Book contributor: Saint Mary’s College of California) [N.B., No Imprimatur, but quite orthodox]
The visible church, her government, ceremonies, sacramentals, festivals and devotions, a compendium of “The externals of the Catholic church”, 5th ed., rev., by John F. Sullivan ; with 120 illustrations from pen drawings by the author. (New York: P.J. Kenedy & Sons, 1922). Available at Open Library.
Reasonableness of Catholic Ceremonies and Practices, by John J. Burke (New York: Benziger Brothers, 1909). With Imprimatur. Available on Project Gutenberg and in even more formats at Many Books.net.
The Sign of the Cross in the Nineteenth Century, by Mgr. Jean-Joseph Gaume. With a letter from the Prefect of the Sacred Congregation of the Index conveying the approbation of Pope Pius IX. May be read online at Catholic Spiritual Direction.