Graph content below....
I've always been interested in graph knitting, since my mom made many sweaters in that style for me, my brother and years later, for my daughter, too.
Mary Maxim and Knit-O-Graf were the biggest companies publishing those designs back in the day. Today, MM sells kits for their original patterns.
If you'd like to know a little bit more about this, check out this fiber arts blog post, written by yours truly.