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

Puerto Rico GPS Network - BYSP-Bayamon Science Park P.S.
Start: 06-May-2008
End: 01-Sep-2011
Wang, Guoquan, 2011, Puerto Rico GPS Network - BYSP-Bayamon Science Park P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/T5X63K81

Puerto Rico GPS Network - BYSP-Bayamon Science Park P.S.
Start: 06-May-2008
End: 30-Jul-2019
Lopez, Alberto, Wang, Guoquan, 2011, Puerto Rico GPS Network - BYSP-Bayamon Science Park P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/T5NP22R2

Puerto Rico GPS Network - BYSP-Bayamon Science Park P.S.
Start: 01-Sep-2011
End: 30-Jul-2019
Lopez, Alberto, 2011, Puerto Rico GPS Network - BYSP-Bayamon Science Park P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/T5SF2THV