I was doing research for something and I noticed something odd about Action and Detective. In the mid 70's their numbering was the same, so issue 451 of Action came out the same month that 451 of Detective did. Obviously at some point this had to have been orchestrated, because Detective started before Action, and if they were being released at the same pace should have a slight lead.
But then it looks like Detective went to a bi-monthly schedule for a while. I find that really odd. DC is literally named for this book and I can't imagine Batman not selling well enough.
So I just wonder if anyone knows what happened. It's kind of a shame because it would have been cool to have both of them hit 1,000 at the same time.