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

MAGNET - GUNL-GUNL P.S.
Start: 19-Oct-2010
End: 07-Jun-2017
Blewitt, Geoff, Hammond, William C., Kreemer, Corne, 2011, MAGNET - GUNL-GUNL P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/T53F4MSH