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

Montserrat GPS Network - HERM-Hermitage P.S.
Start: 08-Aug-1996
End: 19-Sep-1999
Mattioli, Glen, 2000, Montserrat GPS Network - HERM-Hermitage P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/T59S1PDK