From Wells To Anderson; From One To Many

HG Wells wrote one classic, definitive time travel novel merely hinting at the paradoxes whereas Poul Anderson presents multiple fictions:

in the Old Phoenix sequence, many timelines coexist;

in the Time Patrol series, one mutable timeline exists because time travelers can change past events;

in The Corridors Of Time and There Will Be Time, one immutable timeline exists because time travelers cannot change past events;

in Starfarers, one immutable timeline exists because physical time travel is impossible.

Vast, systematic and comprehensive. And don't forget Wells.