We need to use a lot of chemical data throughout the course - melting points, solubilities, enthalpies etc. This CDROM sometimes refers to page numbers for the book of data. This is the Nuffield Advanced Science Revised Book of Data (ISBN 0 582 35448) which you may be using yourself. You may find the more extensive Handbook of Chemistry and Physics, published by the Chemical Rubber Company, in the reference section of your library. Suppliers catalogues are also a good source of information, particularly for current prices. The internet is another source of chemical data.