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

Las Vegas GPS Network - UNR1-UNR1 P.S.
Start: 10-Oct-2002
End: 27-Sep-2018
Kreemer, Corne, Blewitt, Geoff, 2002, Las Vegas GPS Network - UNR1-UNR1 P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/T57S7M2X