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

NASA’s Global GNSS Network (GGN) - MCMC-McMurdo L2C P.S.
Start: 18-Oct-2005
End: 04-Dec-2017
Operators, GNSS, 2008, NASA’s Global GNSS Network (GGN) - MCMC-McMurdo L2C P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/ZWER-J158