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

Salmon Falls Landslide GPS Network - NTOE-North Toe Slope P.S.
Start: 05-Feb-2017
End: 21-Jun-2020
Crosby, Benjamin, 2017, Salmon Falls Landslide GPS Network - NTOE-North Toe Slope P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/T5VX0F99