The following information obtained from UNAVCO's online DOI system:
(https://www.unavco.org/data/doi/search/search.html)

Peatland Minnesota GPS Network - BLEC-Lawn East C P.S.
Start: 10-Aug-2007
End: 03-Jun-2012
Glaser, Paul, 2007, Peatland Minnesota GPS Network - BLEC-Lawn East C P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/T5DV1H6F