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

Costa Rica GPS Network - ELVI-El Viejo P.S.
Start: 30-Apr-2007
End: 13-Nov-2022
Dixon, Timothy H., Protti, Marino, 2008, Costa Rica GPS Network - ELVI-El Viejo P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/T59C6VKN