How a working naval-history library is cataloged

How do you catalog your personal naval-history library?

By combining rough subject areas and memory with a sectioned spreadsheet listing every book.

The physical collection is arranged in broad subject areas rather than a rigid shelf-by-shelf classification. Memory helps locate familiar volumes, but it is not the sole catalog. A spreadsheet records every owned book and divides the collection into searchable sections. That combination lets a researcher browse related material physically while still running a precise title or subject search when answering a question live.