"Stanley--excerpts | for The Purloined Letter"
Mabbott's marginalia is visible in the photocopy. Maureen Mabbott has annotated the photocopy in pen. It is not clear if she marked up the document in different colors, or if the different colors indicate other editorial assistants.
Papers of Thomas Ollive Mabbott, Special Collections, University of Iowa Libraries; “The Purloined Letter,” in Collected Works of Edgar Allan Poe, Vol. III: Tales and Sketches, ed. Thomas Ollive Mabbott (Cambridge: The Belknap Press of Harvard University Press, 1978), 972-997.