1937: 1st, 6/30-7/9, 27,238, Washington, D.C.

1950: 2nd 6/27-7/6, 47,163, Valley Forge, Pa.

1953: 3rd, 7/17-7/23, 45,401, Irvine Ranch, CA

1957: 4th, 7/12-7/18, 52,580, Valley Forge, PA