It means that Monika us asking Phibi Why does she need the atlas? does she need it because she has to submit a report? ( an assignment?)
Monika is assuming that Phibi needs to refer the atlas to work on her report.
Hope this helps.:)
2018년 10월 22일
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'due' is for a scheduled thing that is coming up, eg: His train is due in at 7:50, or Her baby is due on the 29th.
:)