This is the cover of a pamphlet distributed, presumably to campers, their families and friends, and the public to aid in finding specific delegations in the grounds.
This page contains a map of the campgrounds, and where all the delegations camped in relation to each other. The American delegation was near the German and Danish groups, which might explain how well they could have interacted.
This page of the rule book contains some messages from the American Scout leadership to Baden-Powell to congratulate his movement for existing as long as it had.