What songs are in the Beatles' core catalogue?

I'm a huge Beatles fan, and I read recently that their "core catalogue" consists of 217 songs, or about 10 hours. Now I haven't been able to find a list of those songs ANYWHERE. The only info I can find related to the core catalogue other than that 217 and 10 hour number is that it includes their 12 big albums plus MMT. So I made a quick playlist of those on my iphone, and that's only 179 songs. So where do they get 217 from? I'm missing 39 songs, or on average 1 1/2 hours of Beatles music. Are they talking about singles or some other albums that i didn't know they were including?

Come on. Those "core songs" aren't anything out of the extraordinary. It's every song included in their official releases (English catalog), without counting live albums or compilations.