Crossword Genius

Titanic contribution to geographical knowledge? (5)

Ross

I believe the answer is:

atlas

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'knowledge?' is the definition.
(I know that atlas is a type of reference work)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for atlas that I've seen before include "Book of maps - fifteenth satellite of Jupiter" , "Sort of book" , "Segment of spine" , "travel book" , "Large-format book" .)

I've seen this clue in the Evening Standard.
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