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

PBO GPS Network - AC34-OldHarbor_AK2006 P.S.
Start: 23-Jun-2006
End: 01-Jun-2022
UNAVCO Community, 2006, PBO GPS Network - AC34-OldHarbor_AK2006 P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/T5028PG3