Crossword Genius

Reference book published since 1849 by A & C Black (4,3)

Ross

I believe the answer is:

whos who

(Other definitions for whos who that I've seen before include "Top-people book" , "Top people's directory" , "short lives" , "Directory of people" , "people get in here when famous" .)

I've seen this clue in The Independent.
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