The question has come up in the past about the sources people are working from. For what it's worth: the sources I have are all Bloomsbury Press / Raincoast Press (UK / Canada) – although my books are all Raincoast Press, as I am in Canada, the text is identical with the Bloomsbury books.
Philosopher's Stone (US edition is called Sorcerer's Stone): 1997, the earlier edition with "1 wand" listed twice in the book list
Chamber of Secrets: 1998
Prisoner of Azkaban: 1999
Goblet of Fire: 2000
Order of the Phoenix: 2003, First Canadian Edition
Half-Blood Prince: 2005
Deathly Hallows: 2007
When withinfocus trimmed back his participation in this project, I took over a lot of the editing work on the Muggles' Guide; however, I have become tired also of the job, and am electing to cut back my editing significantly. We are extremely lucky to have some very enthusiastic writers still on this project, after so very many years; and in particular, PNW Raven, still going strong, is likely your best bet for guidance if you are interested in helping out.