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

Puerto Rico GPS Network - CUPR-Culebra Island, Puerto Rico P.S.
Start: 31-Oct-2008
End: 01-Sep-2011
Wang, Guoquan, 2011, Puerto Rico GPS Network - CUPR-Culebra Island, Puerto Rico P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/T55Q4TFW

Puerto Rico GPS Network - CUPR-Culebra Island, Puerto Rico P.S.
Start: 01-Sep-2011
End: 05-Sep-2022
Lopez, Alberto, 2011, Puerto Rico GPS Network - CUPR-Culebra Island, Puerto Rico P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/T59G5K45

Puerto Rico GPS Network - CUPR-Culebra Island, Puerto Rico P.S.
Start: 31-Oct-2008
End: 05-Sep-2022
Lopez, Alberto, Wang, Guoquan, 2011, Puerto Rico GPS Network - CUPR-Culebra Island, Puerto Rico P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/T51Z42R0