I remember seeing their Lore & Language when I was a student in the early 6os. I found it fascinating to compare the sayings that I remembered in the playground with those they had collected, and with those remembered by fellow students from different parts of the country.
Also fascination to see in the Mudcat thread "Child's Game: Elastics" Joe Offer's post quoting their research into the spread of the game. I hadn't played it, my sister called American skipping and searched for elastic bands to link together, my children played using knicker elastic and called it Elastics and later there were special elastic ropes sold for it. They traced its spread across the world.