Each time you add a keyword the items including that keyword are brought to the top of the display. It is important to try some synonyms as the results will vary. When combinations of words are entered again you will get different results. Classmarks The OPAC will give you the Location number of books etc. This is a number taken from the classification scheme which aims to put all books about the same subject together on the library shelves.
Broader topics come first and are followed by books on more specialised aspects of the subject.
Very often, however, different aspects of a subject can be scattered. Once you have found some useful items you can double- check for extra material by entering these numbers in the Classmark enquiry. You will be presented with a list of numbers which are similar to the one entered. Finding information in periodicals You will not always find the information you need in books. In particular , if you need very up-to date information you will find that, because of delays in the publication process, the latest developments of the last year or two are not covered in books even those newly published.