Hi, new here and new to the omnibus collecting. I have noticed while watching some Youtube videos that some Omnibuses actually collect the letters pages that originally came with the comics. So far as I can tell it's pretty much only a Marvel thing, It showed up in Amazing Spider-man and Uncanny X-Men and I think Morbius. Is there anyway I can find a list or at least have an idea of which Omnibuses collects the letter pages of the issues. For me having them more complete like this is a major plus and I'd like to focus on getting those first. Thanks again and if this has already been answered please feel free to guide me to the correct area.