What newspaper does Atticus read in To Kill a Mockingbird?

In Chapter 2 of "To Kill a Mockingbird," Scout disturbs her new teacher, Miss Caroline, who has entered Maycomb's school with fixed preconceptions about what first-graders should know.  When Scout is able to read from The Mobile Register, the teacher is appalled,

Now you tell your father not to teach you any more.  It's best to begin reading with a fresh mind...Your father does not know how to teach...."

Maycomb, Alabama, is in the far southern part of the state, not far from the port city of Mobile, which is the only large city in this part of the state.  The fact that Atticus reads this paper besides reading the town's little newspaper, The Maycomb Tribune, indicates his education and broad mind that is concerned with more than what happens in his small town.