Guys, Dave Hornish (ToppCatt) has a real nice blog explaining some of the sheet layouts that topps used in the 60s. I can't do it justice, but the theory is that topps produced two sheets (132 cards per sheet 12 rows of 11 cards each) for each series, and each row was printed a different number of times on the left vs. right sheet, so in order to know the true short prints, you have to look at how many times a particular card's row showed up in the grand scheme of 24 rows (across the two sheets). He has a nice breakdown for 67.....the seaver is in a row that only shows up 2 times out of 24....the most shortly printed cards are those 11....then there are several rows that show up 3 out of 24, and 4 times out of 24, etc....so there is a complicated determination beyond just short and regular printing. see his website blog at the topps archives.
Here is a link:
http://toppsarchives.blogspot.com/20...lin-short.html