Avengers Annual #7 is a huge book!  It features the first appearance of all 6 infinity gems.  It contains the story of the first battle between Warlock and Thanos.  The death of Pip the Troll, Gamora, and Warlock are all inside.  Jim Starlin tells the story AND does the art.  The book is a king-size, square bound book, so it is hard to find without a crushed, twisted or poorly-aligned spine.  This one has alignment that is slightly off but the spine is undamaged and pretty square.  It is graded 9.2 NM- with white pages by CGC.