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

SuomiNet:G GPS Network - SG08-EF12, Pawhuska P.S.
Start: 19-Sep-2001
End: 14-Feb-2016
Carr, Fred, 2001, SuomiNet-G GPS Network - SG08-EF12, Pawhuska P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/T5BR8QBQ