CALTECH

Set to 3 different clues across 3 published puzzles, most often “Jet Propulsion Lab site” — The New York Times, Sunday, 9 September 2001.

7 letters

Every clue on record, most used first

Jet Propulsion Lab siteonce
The New York Times — Sunday, 9 September 2001
Jet Propulsion Laboratory siteonce
The New York Times — Sunday, 12 September 1999
Operator of the Palomar Observatoryonce
The New York Times — Friday, 20 September 1996