Thomas's Geocache (Princeton, NJ):
Thomas' geocache took the form of a scavenger hunt with clues hidden around Firestone Library.
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The scavenger hunt is as follows (credits to players lb and EP, who originally found and photographed it):
TH
In the twins' powerpoint about Thomas, there is a library call number and page number hidden in Thomas' photo. Checking that book out in Firestone, players found this slip:

which corresponds to the following book, with another slip of paper tucked inside it:



When curled around a pencil, it reveals:

The book Vie De Mallarmé hid a sheet of paper, which, when aligned with page 296, reveals:


This leads to the following book:



When decoded, this message translates into the text on this sign, also located within the library:

When taken out, the back of the sign reads this:

This leads to the following book:


which leads to the following book:


This leads to the following:



One drawing specifies a study carrel, while the other specifies a spot on the study carrel's shelf.


Sandwiched in between the top shelves was a letter from Thomas.




