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

PBO GPS Network - P813-WilburMastWA2013 P.S.
Start: 29-Aug-2013
End: 21-Apr-2020
UNAVCO Community, 2013, PBO GPS Network - P813-WilburMastWA2013 P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/T5W093Z3