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

Colorado Plateau/MAGNET - GSES-GSES P.S.
Start: 03-Aug-2010
End: 25-Dec-2019
Kreemer, Corne, Bennett, Rick, 2011, Colorado Plateau/MAGNET - GSES-GSES P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/T5765CH7