Mammoth Book of Alternate Histories by Ian Whates, James Morrow, Eugene Byrne, Kim Newman, Suzette Hayden Elgin, Harry Harrison, Tom Shippey, Esther M. Friesner, A.A. Attanasio, Pat Cadigan, Fritz Leiber, Rudy Rucker, Marc Laidlaw, Judith Tarr, Ian R. MacLeod, Chris Robertson, Harry Turtledove, George Zebrowski, Pierre Gévart, Robert Silverberg, Gregory Benford, Pamela Sargent, Frederik Pohl, Stephen Baxter, Paul McAuley, Keith Roberts, Ken MacLeod, Kim Stanley Robinson, Ian Watson