The Nitrogen Fix/Clement, Hal/ISBN 044158117X (134 copies separate)
Nitrogen Fix/Clement, Hal/ISBN 0441581188 (60 copies separate)
The nitrogen fix/Clement, Hal/ISBN 0441581161 (13 copies separate)
The Nitrogen Fix/Clement, Hal/ISBN 0441581188 (11 copies separate)
The Nitrogen Fix (Ace Science Fiction)/Clement, Hal/ISBN 0441581161 (9 copies separate)
The Nitrogen Fix/Clement, Hal/ISBN 0441581161 (8 copies separate)
The Nitrogen Fix/Clement, Hal (7 copies separate)
The Nitrogen Fix/Stubbs, Harry/ISBN 044158117X (6 copies separate)
Nitrogen Fix/Clement, Hal (5 copies separate)
The Nitrogen Fix, A Novel/Clement, Hal (pen name used by Harry Clement Stubbs)/ISBN 0441581161 (2 copies separate)
In der Stickstoff - Klemme./Clement, Hal/ISBN 3404220501 (2 copies separate)
The Nitrogen Fix/Clement, Hal/Manual Entry (2 copies separate)
In der Stickstoff-Klemme/Hal, Clement/ISBN 3404220501 (2 copies separate)
The Nitrogen Fix/Clement, Hal/ISBN 0441581188/Manual Entry (2 copies separate)
In der Stickstoff - Klemme/Clement, Hal/ISBN 3404220501 (2 copies separate)
The Nitrogen Fix/Stubbs, Harry/ISBN 0441581188 (2 copies separate)
The Nitrogen Fix/Clement, Hal, 1922-2003/ISBN 044158117X (1 copy separate)
Nitrogen fix/Clement, Hal (1 copy separate)
The nitrogen fix/Clement, Hal/ISBN 044158117X (1 copy separate)
Nitrogen Fix, The/Clement, Hal/ISBN 044158117X (1 copy separate)
The Notrogen Fix/Clement, Hal (1 copy separate)
The Nitrogen Fix/Hal Clement/ISBN 044158117X (1 copy separate)
The Nitrogen Fix/Hal Clement, (1 copy separate)
The Nitrogen Fix, A Novel/Clement, Hal (no current copies separate)
Nitrogen Fix/Hal Clement/ISBN 0441581188 (no current copies separate)
Clement, Hal - The Nitrogen Fix/Clement, Hal (no current copies separate)