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

MAGNET - SLT2-SLT2 P.S.
Start: 30-Jan-2013
End: 16-Aug-2013
Blewitt, Geoff, Hammond, William C., Kreemer, Corne, 2013, MAGNET - SLT2-SLT2 P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/T52J692V