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

Alaska GPS Network - EYAC-Eyak Ski Area Continuous P.S.
Start: 09-Jul-2005
End: 14-Nov-2022
UNAVCO Community, 2005, Alaska GPS Network - EYAC-Eyak Ski Area Continuous P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/ZW9M-JD12