Penrose Tiles to Trapdoor Ciphers

Revision	When	Who	Comment

9	December 17, 2022	Stew	Edited without comment.
8	November 29, 2022	OnFrATa	Merge works (MRID: 30584)
7	December 25, 2021	ImportBot	import existing book
6	February 14, 2020	MARC Bot	remove fake subjects
5	January 26, 2012	BorrowBot	Adding to In library
4	August 12, 2011	ImportBot	import new book
3	April 28, 2010	Open Library Bot	Linked existing covers to the work.
2	April 20, 2010	WorkBot	update details
1	December 8, 2009	ImportBot	add works page