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

CVO GPS Network - PNHG-Panhandle Gap P.S.
Start: 07-Nov-2007
End: 20-Sep-2022
Lisowski, Michael, 2012, CVO GPS Network - PNHG-Panhandle Gap P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/T5GF0RN8