Dear colleagues, My book on 'Directed Algebraic Topology' is now downloadable, for personal use, from the server of my Department. M. Grandis Directed Algebraic Topology, Models of non-reversible worlds Cambridge University Press, 2009 - free online version at: http://www.dima.unige.it/~grandis/BkDAT_page.html This book was published by Cambridge University Press in 2009, in hardback and e-book editions. By agreement with C.U.P., it is now made freely downloadable, for noncommercial personal use. A few minor corrections have been made. Chapters, sections and subsections are the same as in the C.U.P. editions, but the dimension and numbering of pages does not coincide. I wish to commend the very liberal policy of C.U.P. in favour of the diffusion of research, that allows for the book to be freely accessible two years after the publication date. Best regards Marco Grandis Dipartimento di Matematica Università di Genova Via Dodecaneso, 35 16146 Genova Italy e-mail: grandis@dima.unige.it tel: +39 010 353 6805 http://www.dima.unige.it/~grandis/ [For admin and other information see: http://www.mta.ca/~cat-dist/ ]