Each record was dual sided.
I actually had my drink come out my nose at that one...
With the way modern vinyl is packaged these days, a dual sided album could be considered an EP. It's very common now for an album to span four discs (or quad sided, if you like). If it wasn't for the fact that TimA said it was a few years ago, I would've posited that by using that phrase he was indicating the collection was primarily EPs or shorter albums. :-)