Doubles  

I remember doing the Pocono NASCAR (and USAC Indy car)/Nazareth half-mile doubles on Sundays a lot back in the day and I remember being so worn out from those doubles, even in my very young days. Usually the heat would wipe me out after a long day walking or standing at Pocono and I'd wonder why I'd attempt Nazareth at night? Also I recall a couple times going to the  Nazareth big track (Lindy years when dirt and asphalt in the Penske years) mile races during the day and then going to Grandview for a URC/SMRC race or something like that on a Sunday night and once did that double but to Central PA after Nazareth mile. Did the Syracuse/Rolling Wheels WoO double once.