rnd          date                              length race name                               track                  location   pole position     winning driver
0    1      march 18                     jimmy bryan 150         -       phoenix international raceway        avondale , arizona     bobby unser        bobby unser
1    2      april 23                      trentonian 200         -      trenton international speedway      trenton , new jersey     bobby unser  gary bettenhausen
2    3        may 27  international 500 mile sweepstakes         -         indianapolis motor speedway        speedway , indiana     bobby unser       mark donohue
3    4        june 4                    rex mays classic         -  wisconsin state fair park speedway    west allis , wisconsin     bobby unser        bobby unser
4    5       july 16                        michigan 200         -     michigan international speedway       brooklyn , michigan     bobby unser        joe leonard
5    6       july 29                        schaefer 500         -        pocono international raceway  long pond , pennsylvania     bobby unser        joe leonard
6    7     august 13               tony bettenhausen 200         -  wisconsin state fair park speedway    west allis , wisconsin  mario andretti        joe leonard
7    8   september 3                      california 500         -              ontario motor speedway      ontario , california     jerry grant    roger mccluskey
8    9  september 24                         trenton 300         -      trenton international speedway      trenton , new jersey     bobby unser        bobby unser

Table as JSON:
{"rnd":{"0":1,"1":2,"2":3,"3":4,"4":5,"5":6,"6":7,"7":8,"8":9},"date":{"0":"march 18","1":"april 23","2":"may 27","3":"june 4","4":"july 16","5":"july 29","6":"august 13","7":"september 3","8":"september 24"},"length":{"0":"jimmy bryan 150","1":"trentonian 200","2":"international 500 mile sweepstakes","3":"rex mays classic","4":"michigan 200","5":"schaefer 500","6":"tony bettenhausen 200","7":"california 500","8":"trenton 300"},"race name":{"0":"-","1":"-","2":"-","3":"-","4":"-","5":"-","6":"-","7":"-","8":"-"},"track":{"0":"phoenix international raceway","1":"trenton international speedway","2":"indianapolis motor speedway","3":"wisconsin state fair park speedway","4":"michigan international speedway","5":"pocono international raceway","6":"wisconsin state fair park speedway","7":"ontario motor speedway","8":"trenton international speedway"},"location":{"0":"avondale , arizona","1":"trenton , new jersey","2":"speedway , indiana","3":"west allis , wisconsin","4":"brooklyn , michigan","5":"long pond , pennsylvania","6":"west allis , wisconsin","7":"ontario , california","8":"trenton , new jersey"},"pole position":{"0":"bobby unser","1":"bobby unser","2":"bobby unser","3":"bobby unser","4":"bobby unser","5":"bobby unser","6":"mario andretti","7":"jerry grant","8":"bobby unser"},"winning driver":{"0":"bobby unser","1":"gary bettenhausen","2":"mark donohue","3":"bobby unser","4":"joe leonard","5":"joe leonard","6":"joe leonard","7":"roger mccluskey","8":"bobby unser"}}