A sampling from Tom’s list:
Bennett, Richard. On the Wings of Grace Alone (2015). AMZ (available from Amazon)
Boettner, Loraine. The Mass (1970). TP (available from Amazon third-party sellers)
McCarthy, James G. The Gospel According to Rome (1995). AMZ
Tom said about this book, “If I had to recommend only one book to interested Catholics it would be ‘The Gospel According to Rome’ by James G. McCarthy…”
Kauffman, Timothy F. Quite Contrary: A Biblical Reconsideration of the Apparitions of Mary (1998). TP
Kauffman, Timothy F., ed. Geese in Their Hoods: Selected Writings on Roman Catholicism by Charles Haddon Spurgeon(1997). TP
There are many more for study at excatholic4christ’s Books page.