In 1972 Topps Football went horizontal for certain teams while others were vertical. It seems that Topps just chose the teams with the shorter names for the horizontal format while those with longer names had the more traditional vertical format.
The other thing that Topps did in 1972 was have a "Pro
Action" sub-set. Similarly, Topps Baseball had an "In Action" subset. Ron Santo had a 1972 In Action card so I needed to make a Pro Action card of Santo, too.