Event:
Cards' Joe Cunningham hits 2 home runs for record 3 home runs in his 1st 2 days
More Notable Events on July 1:
1997 U.K. returns Hong Kong to China
1963 U.S. postal service institutes zip code system, Zone Improvement Plan
1917 257cm-mirror for Mount Wilson Observatory mounted
1916 Coca-Cola brings current coke formula to the market
1907 World's 1st air force established in the U.S. Army
