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

Hawaii GPS Network - NPIT-North Pit P.S.
Start: 15-Mar-2008
End: 09-Jul-2018
Miklius, Asta, 2008, Hawaii GPS Network - NPIT-North Pit P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/T5513WFF