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Marvel Graphic Novels (MGN) was a volume of graphic novel trade paperbacks in an over-sized magazine format that was published from 1982 to 1993, often filled with big stories and introductions of new characters and teams, such as the New Mutants or Futurians. Unfortunately they fell to the wayside in the early '90s, when the prestige format came around.
Only the first 20 issues were cataloged as Marvel Graphic Novel #1, #2, #3, etc. After these 20 issues, Marvel continued the volume for another 18 graphic novels officially. The Overstreet Comic Book Price Guide began to label them #21-38 as part of the volume, but the titles in the indicia were shown unnumbered, as what the cover stated.