It's perhaps appropriate to talk about the impact of publications on one's own work. And I had the great pleasure, in collaboration with yourself, Paul, of producing the book, "Archaeology Theories, Methods and Practice", which Colin Ridler and Thomas Neurath at Thames and Hudson had asked us to put together. And they wanted a, a text book really, mainly for university use on archaeological method and theory and we had the good fortune to discuss that together and just somehow see how that could be put together as a series of questions. What is the nature of the material evidence? When, for the chronology? What's it made of? What were the social relations? What was society like? What did they think? These became the chapter headings for our book and that gave us a chance, indeed the obligation to survey one aspect of archaeology. The methodology of archaeology and the theory of archaeology and I think, because we integrated the two rather successfully, and because you had your own particular strengths, for instance in environmental archaeology and so on, and I had some ideas in, indeed, cognitive archaeology that I wanted to develop in the chapter in “What did they think?” We had a lot to contribute, and it ended up, I think, as a balanced book, where the casual reader really didn't know who had written which chapter, and although we did tend to do it on a chapter-by-chapter basis, and so that I think was a very stimulating book to write and in my case encouraged me to think about the relation between the trade and the social archaeology and try and put the ideas about cognitive archaeology, in a much more straightforward and less highfalutin’ basis, not too much philosophy, more how do you get on and do it in the archaeological practicality. And so, I think we're both happy that that book has sold well and it was first published in 1981, were you reminding me?