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

MAGNET - SNRA-SNRA P.S.
Start: 20-Sep-2019
End: 28-Aug-2022
Blewitt, Geoff, Hammond, William C., Kreemer, Corne, 2019, MAGNET - SNRA-SNRA P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/DX4G-Q211