I've been having fun entering stamps and cancelations for about 15 years when visiting the National Parks. I've been wondering, though how others keep theirs organized?
Do you enter the cancelations first, and then search your sheets of stamps to insert the correct stamp, or have you already inserted all the stamps and now you have to search through each passport book for the correct stamp to cancle when you visit that park?

Thanks,
Chris G.

Hey, I'm just lucky if I can show up at the right park at the right time. Any attempt at organization is past me...

I use the chaos method. Find an empty page and stamp it.