Table:
text: 1976 USAC Championship Car season
Schedule and results
Schedule and results
Rnd Date_ Race_Name Length_ Track Location_ Pole_Position Winning_Driver
1 March 14 Jimmy Bryan 150 mi (km) Phoenix International Raceway Avondale , Arizona Al Unser Bobby Unser
2 May 2 Trenton 200 mi (km) Trenton International Speedway Trenton , New Jersey A. J. Foyt Johnny Rutherford
3 May 30 International 500 Mile Sweepstakes mi (km) Indianapolis Motor Speedway Speedway , Indiana Johnny Rutherford Johnny Rutherford
4 June 13 Rex Mays Classic mi (km) Wisconsin State Fair Park Speedway West Allis , Wisconsin Gordon Johncock Mike Mosley
5 June 27 Schaefer 500 mi (km) Pocono International Raceway Long Pond , Pennsylvania Johnny Parsons Al Unser

Question: What was the name of the race where Al Unser took pole position in the 1976 USAC Championship Car season?

Question: What is the name of the track for the international 500 mile sweepstakes race in the 1976 USAC Championship Car season?

Question: At what locations did Gordon Johncock hold pole position in the 1976 USAC Championship Car season?