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

MAGNET - WVRT-WVRT P.S.
Start: 15-Jan-2012
End: 31-Dec-2021
Blewitt, Geoff, Hammond, William C., Kreemer, Corne, 2012, MAGNET - WVRT-WVRT P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/T58S4N4D