If you are familiar with Morris Proctor, you will know that he stresses the importance of knowing how a book is indexed. e.g. verses, pages, headwords
In his courses, he points out that when you know how a book is indexed, you can do things with it that make it more readily accessible. Plus you will know better how to search that book.
He points out a number of books that are indexed in ways we might not have thought of, and which we wish we knew.
I am suggesting that the library add another type section - indexing. It would be good to know all the books that are indexed by Bible verses that are not commentaries, and what books are indexed by headwords that are not Bible dictionaries.
thank you