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

MAGNET - FAND-FAND P.S.
Start: 26-Feb-2015
End: 21-Jun-2022
Blewitt, Geoff, Hammond, William C., Kreemer, Corne, 2015, MAGNET - FAND-FAND P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/T5V1234Q