To provide the user with the another title if needed
This could be for a secondary or original title or subtitle.
For discoverability, improving titles for data is encouraged. This field could be a place to keep the original title. It could also be useful for scanned maps. Some have long titles that include MARC subtitle fields, such as 245$b. Whether or not this field should appear in your GeoBlacklight item view pages can be customized in the application.