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

PANGA/PBO Nucleus GPS Network - MDMT-Medicine Mountain, Oregon P.S.
Start: 05-May-2002
End: 11-Mar-2007
Miller, M. Meghan, 2004, PANGA-PBO Nucleus GPS Network - MDMT-Medicine Mountain, Oregon P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/T55D8PXX

PANGA/PBO Nucleus GPS Network - MDMT-Medicine Mountain, Oregon P.S.
Start: 11-Mar-2007
End: 16-May-2019
UNAVCO Community, 2004, PANGA-PBO Nucleus GPS Network - MDMT-Medicine Mountain, Oregon P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/T5WW7FRR

PANGA/PBO Nucleus GPS Network - MDMT-Medicine Mountain, Oregon P.S.
Start: 05-May-2002
End: 16-May-2019
UNAVCO Community, Miller, M. Meghan, 2004, PANGA-PBO Nucleus GPS Network - MDMT-Medicine Mountain, Oregon P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/T51N7Z72