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

Geopentech GPS Network - THMS-ThurstonMSCA2013 P.S.
Start: 07-Aug-2013
End: 17-May-2021
Walls, Chris, 2013, Geopentech GPS Network - THMS-ThurstonMSCA2013 P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/T5NP22JC