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

Salmon Falls Landslide GPS Network - BLKS-Upper Block South P.S.
Start: 11-Feb-2017
End: 09-May-2018
Crosby, Benjamin, 2017, Salmon Falls Landslide GPS Network - BLKS-Upper Block South P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/T5862F7N