40 songs on 2 records?

I just purchased a vinyl "best of album" that's listing 40 songs on 2 albums. I didn't get it yet but how would that be possible? 20 songs per record?? How can that be? Anyone familiar with something like this?
Post removed 
I remember a sticker on "Get Happy!" a fabulous early '80s record by Elvis Costello and The Attractions, boasting that the record contained "20 Hits! 20!" (Or something quite like that.)
Yup. Ten per side of vinyl. Many of 'em, most of 'em, actually, were quite short, obviously.