I read about the Pee Chee in an old book called 6th grade can really kill you. It was used in the second half of the 20th century, and it's just a folder to store loose leaf papers. It's made of card stock and has the multiplication table inside and other math info. I was interested in the Pee Chee because I was surprised by the name and also that I didn't know about it. Apparently, people stopped using it as commonly but it is available from Mead starting this year.