here and here.
We discuss SM Stirling's works on this blog because:
aspects of Stirling's and Poul Anderson's works are comparable (see the above links);
Stirling contributed to Anderson's Time Patrol series;
like Anderson, Stirling has contributed to Jerry Pournelle's CoDominium future history, one of several such series that in some ways parallel Anderson's Technic History;
Stirling has developed alternative histories further than Anderson did.
I expect shortly to begin reading the first of the two CoDominium novels co-written by Pournelle and Stirling. While discussing such works, it is usually possible to keep touching base with Poul Anderson and other future historians.
I should also track down Anderson's single contribution to the CoDominium History.