Hi, My uni uses the Halliday and Resnick textbook. The uni website says to get either the Principles of Physics Extended 9th Edition or Fundamentals of Physics Extended Edition 8th and that it will cost ~£38. Whilst searching for the text I found some are sold in separate volumes whereas some are not, Some texts say Fundamentals of Physics Extended 9th Edition and others say Principles of Physics Extended 8th Edition... How many volumes are there if I buy separate volumes? Is it a misprint when the book is being described as Principles of Physics Extended 8th Edition or Fundamentals of Physics Extended 9th Edition? since as far as I'm aware Principles is the 9th Edition of Fundamentals is that right? Where should I buy the book in uk, can I really get it for £38? I've seen various versions range from £20 to £150 i.e. a 6th Edition at over £100 and a 9th Edition at under £50 (http://bookshop.blackwell.co.uk/jsp/search_results.jsp?wcp=1&quicksearch=1&cntType=&searchType=keywords&searchData=Fundamentals+of+Physics+Extended&qs-btn=qs-btn [Broken]) is there a reason for this? sorry if this lacks clarity, if you've made it this far, I thank you.