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

Colorado Plateau/MAGNET - DIRT-DIRT P.S.
Start: 29-Jul-2010
End: 29-Apr-2019
Kreemer, Corne, Bennett, Rick, 2011, Colorado Plateau/MAGNET - DIRT-DIRT P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/T5SB43X8