I use it sometimes as a "guide" but with so many errors in it I do not trust all the info at all....They have not checked the information....When the book came out I contacted the publisher with a list of 292 "Facts" that they had got wrong that were not just typos and they said that they would put this right in future editions.....The fact that there never was a future edition could mean that several buyers thought the same as me and failed to recommend the book to others....It is where they mention a record that nobody has ever owned, seen or heard !!.....I am trying to get all the ones that I do not have from the War Years 1940 -1945....I have a lot of them but there are those in my list that I either cannot find or never had....I use other lists and books as well so I think I've got it pretty well nailed on though am always open to be told otherwise.....The ones that you will kindly copy for me will help a lot