here and had already discussed them here.
Poul Anderson's Time Patrol series is a culmination of causality violation. What would be a corresponding work of alternative history? Unfortunately, I have as yet read very few novels or series by Andre Norton, H. Beam Piper or Harry Turtledove, although I understand that Piper's Paratime Police are a sort of opposite number of the Time Patrol.
Of the alternative histories that I have read, SM Stirlings' are consistently superb, in particular The Peshawar Lancers and Conquistador. ...Lancers shows us not only an alternative history but also its corresponding literature and art.
Appropriately, the single Time Patrol story written by Stirling addresses one of the most important speculative questions of alternative history: what would the twentieth century have been like without the assassination at Sarajevo? Thus, this story is a major synthesis of these two temporal themes.