For a fine history of Gasoline Alley read R. C. Harvey’s essay from 2013.
The first three years of Gasoline Alley can be read at Crittenden.
A buncha great Frank King Sunday Gasoline Alleys at The Bristol Board.
Michael Sporn has some nice Dick Moores here and here and here.
GoComics has a deep archive of the Jim Scancarelli Gasoline Alley.
The Comic Art Fans site features original comic strip art by
Frank King, Bill Perry, Dick Moores, and Jim Scancarelli.
edited November 25, 2018 to add
Gasoline Alley at 100 Years and One Day: