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

Puerto Rico GPS Network - MAYZ-MayaguezTGPR2010 P.S.
Start: 06-Feb-2010
End: 01-Sep-2011
Wang, Guoquan, 2011, Puerto Rico GPS Network - MAYZ-MayaguezTGPR2010 P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/T5PN93ZS

Puerto Rico GPS Network - MAYZ-MayaguezTGPR2010 P.S.
Start: 01-Sep-2011
End: 19-Sep-2017
Lopez, Alberto, 2011, Puerto Rico GPS Network - MAYZ-MayaguezTGPR2010 P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/T5JW8C61

Puerto Rico GPS Network - MAYZ-MayaguezTGPR2010 P.S.
Start: 06-Feb-2010
End: 19-Sep-2017
Lopez, Alberto, Wang, Guoquan, 2011, Puerto Rico GPS Network - MAYZ-MayaguezTGPR2010 P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/T5F47MGM