…prepare blank petitions and cause them to be printed upon single sheets of white paper of good quality, nine and one-half inches in width and thirteen inches in length,with a margin of one and three-quarters inches at the top for binding.
9.5×13? Did they just pull that out of a hat? That is so close to 8.5×11 that it would make sense just to shrink it.
That is just a weird number. The original 1913 state requirment was 9×12, maybe it has something to do with that. Probably not though.