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

MAGNET - NORA-NORA P.S.
Start: 20-Sep-2019
End: 07-Oct-2021
Blewitt, Geoff, Hammond, William C., Kreemer, Corne, 2019, MAGNET - NORA-NORA P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/K134-FZ18