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

CVO GPS Network - TMBU-Tom Butte P.S.
Start: 30-Sep-2011
End: 17-Oct-2022
Lisowski, Michael, 2012, CVO GPS Network - TMBU-Tom Butte P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/T5HD7SS3