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

Colorado Plateau - HARQ-HARQ P.S.
Start: 21-Aug-2010
End: 12-Jan-2019
Kreemer, Corne, Bennett, Rick, 2012, Colorado Plateau - HARQ-HARQ P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/T56971RQ