The classmark is the key to finding the book you want and should be noted down very carefully. A full stop or decimal point can be crucial. If, even bearing these points in mind, you can find no classmark on an entry it is likely to be a cross-reference and should be read right through to discover the point in the catalogue to which you are being redirected. Various methods have been used to indicate the presence of more than one copy of a book. That given above implies two copies with classmarks identical except for the last element, i.e. 730.c.97.202 and 730.c.97.292.
Most recent practice gives the full classmark of each copy on a separate line.
Additional copies, particularly if they differ in some respect from the first, may also be added below the entry for the first copy, a method used also for some different issues or editions. There are many detailed aspects of cataloguing rules and practice which it has not been possible to cover in this short guide. Whenever you have any difficulty in using the catalogues, please do not hesitate to enquire at the Catalogue Enquiries Desk or at the staff desk in the Reading Room. A Readers' Handbook binder to hold this series of leaflets is available at the Borrowing Desk, price 50p.