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

CVO GPS Network - PNHR-Panhandle Gap P.S.
Start: 06-Sep-2012
End: 05-Oct-2015
Lisowski, Michael, 2013, CVO GPS Network - PNHR-Panhandle Gap P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/T5639MVS