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Douglas Hartley

D,. H.. ยท D. Hartley

titlemedia typeISBN-13
(ISBN-10)		year of publication
Solving the Assistant Principal's PuzzleHardcover978-1-138-47258-7
(1-138-47258-1)		2017
Solving the Assistant Principal's PuzzlePaperback978-1-59667-120-1
(1-59667-120-3)		2009

Douglas Hartmann