I think I posted this Xerox before but a little latitude please, lol.
I often see an original art board with push pin holes in it and wonder "who the hell would do that?"
But looking at the Xerox of ASM 134 page 31, I think the answer is.... Ross Andru.
The push pin holes on both are in the same location (look at that oil spot on the fourth panel in the margins.
So, either Ross or the letterer must have used them to secure the board while working, since the next stop was Dave Hunt.
I also notice the original art board has been trimmed (because the notes in the margin are gone). I think this had to due with reproducing the art for the printing plate, but I could be blowing smoke on this one.