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

HoustonNet GPS Network - COTM-College of the Mainland P.S.
Start: 03-Feb-2015
End: 14-Nov-2022
Wang, Guoquan, 2015, HoustonNet GPS Network - COTM-College of the Mainland P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/T5WD3XVJ