This is the bonus cache hide for the "Take a Book, Leave a Book" Adventure Lab here in Vacaville.
The AdLab takes geocachers to five Little Free Libraries scattered across Vacaville, in five different neighborhoods.
The final location is found at N 38 21.ABC W 121 58.DEF, where ABC DEF are found in the Journals in the Lab locations
Congratulations to MsAHH for "FTF" honors!