Books of maps (7)

I believe the answer is:

atlases

'books of maps' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for atlases that I've seen before include "Sea salt (anag.)" , "Cartographical works" , "Map books" , "Collected charts" , "navigation aids" .)

I've seen this clue in The Irish Times, The Star Tribune, the USA Today, the Irish Times (Simplex) and the Family Time.

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