The ISBN provided is only for volume 1 of 5. This set is in like new condition and doesn’t even appear to ever have been used. It is the 2009 edition and covers ALL (I was only allowed to choose 1 for the “subject” category) school subjects for elementary, junior high and high school levels. Pango only allows you to choose up to 8-10 pounds for shipping but this set weighs 31 pounds so shipping will be $25. I contacted Pango about some of the listing issues/limitations but there was nothing they could do about them. They just suggested that I note the additional information for the set in this description. This last price reduction (minus Pango’s 20% fee) will allow me to MAYBE break even. Now I’m definitely going to be taking a loss.