How do I make iTunes recognize several songs as one album?

I recently downloaded "Transatlanticism," (not from iTunes), and am having serious trouble making my iTunes library recognize all of the songs as one album. I went into the meta data, and entered in artist, ("Death Cab for Cutie"), year ("2003"), album name, ("Transatlanticism"), and number of tracks in the album ("11") EXACTLY the same for every song, and there is no other meta data that I have filled in, and yet it still arbitrarily has the tracks split up into three different albums, each by Death Cab for Cutie, and called Transatlanticism. Why won't it consolidate them, and is there anything I can do to make the program recognize that it's one album?