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

CVO GPS Network - SNRS-Sunrise Ski Dorm P.S.
Start: 20-Sep-2007
End: 24-Jan-2021
Lisowski, Michael, 2012, CVO GPS Network - SNRS-Sunrise Ski Dorm P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/T5P26W7W