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

Hawaii GPS Network - HALP-Halulu P.S.
Start: 21-Dec-1999
End: 30-Apr-2002
Segall, Paul, Miklius, Asta, 2000, Hawaii GPS Network - HALP-Halulu P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/T5610XC4