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

Rio Grande Rift GPS Network - RG04-RG04HarralNM2006 P.S.
Start: 25-Oct-2006
End: 13-Nov-2016
Sheehan, Anne, 2007, Rio Grande Rift GPS Network - RG04-RG04HarralNM2006 P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/T5TX3CMB