Helmuth Hausen, "Heat Transfer in Counterflow, Parallel Flow & Cross Flow". Translated from the German by Mandy S Sayer, Published by McGraw-Hill in 1983. As the Editor of this translation, I can think of no better tribute than a letter I received from the now late Professor Hausen: "Gladly I use this occasion to thank you and Mrs Sayer for the enormous work and trouble you took in translating and editing my book. Please give my compliments to Mrs Sayer. Yours sincerely, Helmuth Hausen." For my part, I shall always remember Mandy's kindness and generosity of spirit during the long period while this translation was being prepared. A friendship between Many and Joe on the one hand and my wife Joan and myself on the other was firmly consolidated. We shall never forget Mandy although the copy of the translation sits on my bookshelf will always remind me of her.