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

Southwest Montana GPS Network - CNDN-Garr Canyon Ranch P.S.
Start: 12-Nov-2011
End: 10-Jul-2016
Bendick, Rebecca, 2012, Southwest Montana GPS Network - CNDN-Garr Canyon Ranch P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/T5HT2M73