I purchased this dictionary some years ago, hoping it would have terms some of my other English-Spanish technical dictionaries do not have. It however had very little or none to contribute. I truly think that Publishers, of this type of literature should be more responsible about the books they publish; not just for selling. New books should make a significant contribution. I am now wondering if I should pursue the purchasing of a new technical dictionary from Amazon; since they are both published by Routledge and Keagan Paul Ltd.