Longest book series - travel guides
JTB Publishing
Japan ()
The longest series of published travel guides is the 'Rurubu' series which, as at 2 November 2010, consisted of 3791 editions. Rurubu has been published continuously by JTB Publishing (Japan) since August 1984. Rurubu began modestly, publishing four editions in 1984. It expanded rapidly and was publishing more than 100 titles a year by 1993.