**/{BookDescription,BookDescription}*.csv{,.gz} (as specified by book-description.file-pattern). A sample file is BookDescription. This file is loaded using the BookDescription topic. See the Topic Aliases table for an understanding of the topic aliases associated with each topic.
| Field | Key | Null | FieldType | Description | Example |
| Book | Y | N | String | Name of the Book. | |
| Desk | N | Y | String | Name of the Desk to which the Book belongs. | |
| AsOfDate | Y | N | Date ‘YYYY-MM-DD’ | Timestamp (at close of business) for the data. | |
| IRT Flag | N | Y | ‘Y’ or ‘N’ | Indicates whether the desk is an Internal Risk Transfer (IRT) desk. ACR is calculated separately for desks flagged as IRT. Defaults to ‘N’ To support multiple jusrisdictions (where the collection of books in the IRT desk for the group might be different from those for the local legal entities), you can use the IRT Desk Groups input file. |