Clue 1


Each string of numbers represents a book...




Clue 2


They are ISBN numbers, to be specific.




Solution


Each title has the name number of letters as are in its ISBN. The marked numbers correspond to those letters in each title.





Clue 1


Each string of numbers represents a book...




Clue 2


They are ISBN numbers, to be specific.




Solution


Each title has the name number of letters as are in its ISBN. The marked numbers correspond to those letters in each title.





Clue 1


This is an Arnold cipher... but what's the key book?




Clue 2


Does this font look familiar?




Solution


The quote from the front of the card with the matching font comes from the key book that will decipher your Arnold cipher.





Clue 1


Each string of numbers represents a book...




Clue 2


They are ISBN numbers, to be specific.




Solution


Each title has the name number of letters as are in its ISBN. The marked numbers correspond to those letters in each title.





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