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

Denali Fault GPS Network - SDOU-Sourdough P.S.
Start: 18-Sep-2003
End: 16-Jun-2007
Freymueller, Jeffrey T., Burgmann, Roland, 2004, Denali Fault GPS Network - SDOU-Sourdough P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/T51Z42SF