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9 results for ISOTOPES from Modern Era puzzles:

Date	Grid	Clue	Author
Sun Aug 14, 2016	4D	Uranium 238 and strontium 90	Ian Livengood
Wed May 11, 2016	36D	Deuterium and tritium	Pawel Fludzinski
Mon Nov 28, 2011	5D	Springfield's minor-league team on "The Simpsons"	Andrea Carla Michaels
Fri Jun 3, 2011	63A	Chemist's relatives?	Jeffrey Wechsler
Wed May 5, 2010	58A	Carbon 14 and uranium 235	Dan Schoenholz
Tue Mar 1, 2005	55A	Deuterium and tritium, to hydrogen	Gilbert H. Ludwig
Mon Jul 10, 2000	10D	Some are radioactive	Gene Newman
Tue Jun 4, 1996	37D	Atoms with the same number of protons	E. Early
Mon Sep 25, 1995	43D	Carbon 14 and others	Gregory E. Paul

1 result for ISOTOPES from Variety puzzles:

Date	Type	Grid	Clue	Author
Jul 27, 2014	Acrostic	U	Relatives of a fundamental sort	Emily Cox & Henry Rathvon

5 results for ISOTOPES from pre-Shortz puzzles:

Date	Grid	Clue	Author	Editor
Fri Dec 15, 1989	40D	Protium and tritium, e.g.	Jim Page	Maleska
Thu Dec 13, 1973	4D	U 235 et al.	Unknown	Weng
Fri Apr 3, 1953	41D	Elements having the same atomic number.	Roberta Morse	Farrar
Mon Jan 19, 1953	20A	Basis of most chemical elements.	George Henderson	Farrar
Sun Aug 27, 1950	42D	Forms of elements having same atomic number.	Harold T. Bers	Farrar

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