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I'm a little lost about Prisoner of Azkaban's timeline. Did Scabbers disappear prior to Harry losing the Marauder's Map? What chapters should I be looking at?
Yes, Harry did have the map when Scabbers was with Ron.
He loses the map in chapter 14 : Snape's Grudge.
Scabbers dissappears in chapter 12.
Harry gets the map in chapter 10
Hope that this answers your question
EDIT : So yes, Scabbers disappeared before Harry lost the map.
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