Ridling Bible Atlas is a 197 topics (about 180+ maps) that deal with Bible events and people from the Old Testament through the post New Testament age.
This Darby Bible Dictionary has 8400+ entries. Written by Brethren author John Darby, it has the Brethren point of view.
Thomas Brooks Complete Works is a 6 volume work on the works of Thomas Brooks.
Augustine Works of Saint Augustine Selected is a selection of Saint Augustine’s works, City of God (heaven) confessions, on Christian Doctrine, etc.
This dictionary Jackson Dictionary of Proper Names has just 23 chapters, one for each letter of the alphabet. In each one, it has all the proper names beginning with that letter, and its meaning.
A Dictionary of Catechisms from Puritan, Reformed, and several other denominations, such as Baptists, Broadus, Gadsby, Owen, etc.
Hitchcock’s Bible Names Dictionary (1869) gives the meaning of names in the Bible from the original languages as well as other information.
Trench’s Classic work, Synonyms of the New Testament, is a study of Greek synonyms in the New Testament, showing their similarities and differences.
This is an old dictionary of Christianity in which a lot of unused (in modern speech) terms are defined. Over 1500 entries.
This work has the first part of the nicene fathers (that of the earlier works).