EYETESTS

Set to 2 different clues across 2 published puzzles, most often “Providers of peer review?” — The New York Times, Saturday, 22 September 2007.

8 letters

Every clue on record, most used first

Providers of peer review?once
The New York Times — Saturday, 22 September 2007
They're useful in making contactsonce
The New York Times — Sunday, 27 April 1997