Specifically, it reprinted Giant-Size X-Men #1 and Uncanny X-Men #94-206, with the exceptions of #106, 110, 141 and 142. The first 27 issues have various edits and new pages added to tie in with then-current continuity.
Specifically, it reprinted Giant-Size X-Men #1 and Uncanny X-Men #94 through #206, excluding #106, 110, 141, and 142. The initial issues had alterations and additional pages to connect with the current storyline.