Mental_floss Sudoku: It's the Brain Candy You've Been Craving!
by Frank Longo
ISBN 13: 9781402789397
Format: Spiral-bound (160 pages) Publisher: Puzzlewright Published: 06 Nov 2012
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Fertilization
ISBN 13: 9780412563508
Format: Paperback (340 pages) Publisher: Routledge Published: 27 Feb 1997
Skill Builder Sudoku: Easy to Medium
by Peter GordonFrank Longo,
ISBN 13: 9781454958864
Format: paperback Publisher: Puzzlewright Press