Ultimate Frisbee Official Rules 1970
Take a look at this copy of the 1st edition (?) of the rules – given to me as an MVP prize by a long forgotten team, after a game at Paganello many years ago. Loads of quirky and interesting things within, including travels being turnovers, “this sport can be played with as many as 20 or 30 per team”, and the suggestion that hills or rivers are used as natural sideline boundaries.