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

Rio Grande Rift GPS Network - RG20-RG20PutneyCO2006 P.S.
Start: 20-Sep-2006
End: 04-Dec-2020
Sheehan, Anne, 2006, Rio Grande Rift GPS Network - RG20-RG20PutneyCO2006 P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/T5HH6H95