I haven't found anything on the distributon of cards in the Swell (Philadelphia) Babe Ruth Story set.
It appears to me that numbers 1-14 are much more common than 15-28. Yes, I know that the Babe himself is found in the high numbers, but even the 100% non-sports examples seem much scarcer.
If my observation is correct, here is an explanation (Thanks, Dan)
http://www.network54.com/Forum/526604/t ... +Story+set
The additional key is that low numbers go from 1-16 and high numbers 17-28.