Local Library - Saint Anthony Park Multi-Cache

At the first Stage you'll find a plaque, figure out the information below to find the location of the final cache! And I'm hoping you find some humor with the final cache. ;-)

** Note: This cache is placed by permission of the Saint Paul Public Library **

Normal Library Hours (subject to change):

Mon, Wed: 12 - 8 pm
Tue, Thu, Fri: 10 am - 5:30 pm
Sat: 11:30 am - 5 pm
Sun: Closed 

To get credit for this cache, you MUST sign the log.

Now to the field puzzle, starting at the provided coordinates, solve the whole string below:

The final can be found by doing the math on the lower case letters: GV aaaa.Gbb Pbb cccc (REF)

aaaa = The FIRST set of 4 numbers on the plaque minus 715

bbbb = The SECOND set of 4 numbers plus 2664

cccc = The THIRD set of numbers plus 21