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

CVO GPS Network - PMAR-Pine Marten P.S.
Start: 02-Jan-2004
End: 19-Sep-2022
Lisowski, Michael, 2012, CVO GPS Network - PMAR-Pine Marten P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/T56W987H