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

COCONet GPS Network - CN48-GrandSvneDMA2014 P.S.
Start: 21-Oct-2014
End: 08-Apr-2019
UNAVCO Community, 2014, COCONet GPS Network - CN48-GrandSvneDMA2014 P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/T5V1232T