Interestingly enough, the Massasoit Spring memorial in neighboring Barrington isn't actually the only such memorial. The memorial here in Warren was erected in 1907 and actually has its own committee dedicated to maintaining it and welcoming anyone who wishes to visit the memorial. More information on the committee and/or history of the memorial can be found here.
Now for the puzzle. At the memorial, you will notice there are 45 words on the plaque (this includes one date...assume it to be a word for this calculation). You will need to assign each word on the plaque a number, going in order from the top (This = 1, Tablet = 2, etc.). You will need the number of letters in each word, so be sure to count both carefully!
The actual cache can be found here: North 41 43.UVW West 071 17.XYZ
U = Number of letters in word #7.
V = Number of letters in word #34.
W = Number of letters in word #36 MINUS word #3.
X = Number of letters in word #44 MINUS word #41.
Y = Number of letters in word #6.
Z = Number of letters in word #32.
The final cache is located approximately 0.35 miles away from the memorial in a potentially very high muggle area in the summer, so stealth is a must during the appropriate season. As mentioned before, the container you're looking for is a bison tube, and please make sure it screws shut. Thank you, and hope you enjoyed this piece of history!
If you need to, you can check your coordinates here: GeoChecker.com.