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

Northern Basin and Range GPS Network - UPSA-Upsal Hogback P.S.
Start: 24-Aug-2005
End: 14-Nov-2022
UNAVCO Community, 1998, Northern Basin and Range GPS Network - UPSA-Upsal Hogback P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/T5D798S0

Northern Basin and Range GPS Network - UPSA-Upsal Hogback P.S.
Start: 30-Oct-1997
End: 24-Aug-2005
Davis, James, 1998, Northern Basin and Range GPS Network - UPSA-Upsal Hogback P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/T58K77D3

Northern Basin and Range GPS Network - UPSA-Upsal Hogback P.S.
Start: 30-Oct-1997
End: 14-Nov-2022
UNAVCO Community, Davis, James, 1998, Northern Basin and Range GPS Network - UPSA-Upsal Hogback P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/T54T6GQT