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

Galapagos GPS Network - GV01-GV01 P.S.
Start: 31-Aug-2018
End: 30-May-2022
LaFemina, Peter, Amelung, Falk, 2002, Galapagos GPS Network - GV01-GV01 P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/XVJ3-KE55

Galapagos GPS Network - GV01-GV01 P.S.
Start: 27-May-2002
End: 31-Aug-2018
Geist, Dennis, Chadwick, Bill W., Meertens, Charles, 2002, Galapagos GPS Network - GV01-GV01 P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/T5HD7SXW

Galapagos GPS Network - GV01-GV01 P.S.
Start: 27-May-2002
End: 30-May-2022
LaFemina, Peter, Amelung, Falk, Geist, Dennis, Chadwick, Bill W., Meertens, Charles, 2002, Galapagos GPS Network - GV01-GV01 P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/ESJY-V915