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

SCIGN USGS GPS Network - LEE2-Mt Lee #2 (Hollywood Sign) P.S.
Start: 15-Jul-2021
End: 14-Nov-2022
Operators, SCGN, 2021, SCIGN USGS GPS Network - LEE2-Mt Lee #2 (Hollywood Sign) P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/B2SP-0436