NEW PROVIDENCE, N.J., Oct. 8, 2014 /PRNewswire/ — A new analysis of U.S. ISBN data by ProQuest affiliate Bowker reveals that the number of self-published titles in 2013 increased to more than 458,564, up 17 percent over 2012 and 437 percent over 2008. Print titles were up a very strong 29 percent over 2012, indicating the…