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

PBO GPS Network - P156-GibsonRdg_CN2006 P.S.
Start: 08-Jun-2006
End: 02-Sep-2022
UNAVCO Community, 2006, PBO GPS Network - P156-GibsonRdg_CN2006 P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/T5RJ4GDV