You can click to enlarge the image or see the link at the bottom of the post for a pdf. Print on 8.5"x11" and cut according to the trim marks. Then get some delicious candy (like Reeses or something you know for sure that they liked back then) and attach it to the back of your Valentine. Because people don't really like Valentines unless they have candy attached to the back…
Download PDF here. (It will look crappy in your browser but if you download it and open it, it should be fine.) Enjoy!
[All images from pbs.org]