Possible to display comments from several selected posts on one post?

Apologies if this has been addressed already. Our blog has multiple “issues” or groups of posts, and my coworker wants to display all of the comments made on any group of posts in one combined location. IOW, Oct. ’13 posts A, B and C all have independent comments, but we want a post D that shows all of the posts from A, B and C. Is this possible? Is there a plugin for this? Thank you for any ideas!