Hardcover, 2009. Collects 1986's UNCANNY X-MEN #210 - 214, X-FACTOR #9 - 11, NEW MUTANTS #46, THOR #373 - 374, POWER PACK #27, and DAREDEVIL #238.
Published in 2009, X-MEN: MUTANT MASSACRE was, to my knowledge, Marvel's first attempt to collect the complete "Mutant Massacre" event in on volume, including not only the pertinent issues of the mutant titles, X-MEN, NEW MUTANTS, and X-FACTOR, but also the various tangential crossover material from DAREDEVIL, THOR, and POWER PACK.
The book opens with UNCANNY X-MEN #210, X-FACTOR #9, UNCANNY #211, and X-FACTOR #10. From there, we move into the majority of the one- and two-off chapters -- NEW MUTANTS #46, THOR #373, POWER PACK #27, and THOR #374. Then it's back to the "core" material in UNCANNY #212 and X-FACTOR #11, followed by DAREDEVIL's contribution in issue 238, and then the saga is capped off by UNCANNY 213 and 214, which was not originally identified as an official piece of the crossover, but which provides a nice coda to the whole thing.
The reproduction of most of these issues is very nice, with the criminal exception of Alan Davis's X-MEN 213 (below), which looks absolutely horrid and represents an unforgivable crime against one of Marvel's best artists of all time. That issue is, for me, easily the highlight of "Mutant Massacre" in terms of both story and art, and I can't believe it came out looking so awful in this book.