A listing of the series can be found in the Outline Catalogue, available in the Manuscripts Reading Room.

A calendar and index to the unbound in-correspondence (B1-11) were compiled in the 1950s. They were written by hand on, respectively, foolscap sheets and cataloguing slips, and are kept in boxes on the open shelves in the Manuscripts Reading Room. The calendar is arranged in the same manner as the letters - in chronological sequences by the place from which they were written - and are numbered within each sequence. The calendar details the name of the writer, the name of the recipient, the date and the language, but gives no indication of the subject matter.

The index was compiled from the calendar, and records in one alphabetical sequence every individual and firm from whom, or to whom, there is a letter. It does not distinguish between writers and recipients, and gives no further information about the letter other than the number it has been assigned in the calendar. There are no entries for Magniac and Co. or Jardine, Matheson and Co., because they were found to be too numerous to include, but individual partners and members of the firm are named. Some entries include biographical information, and a few include detailed descriptions of the individual concerned.