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

SCIGN USGS GPS Network - WHFG-Hanning Flat GPS P.S.
Start: 10-Aug-2015
End: 07-Nov-2022
Hudnut, Kenneth, Determan, Daniel N., Aspiotes, Aris G., 2015, SCIGN USGS GPS Network - WHFG-Hanning Flat GPS P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/T5959FX7