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

HoustonNet GPS Network - UHEP-University of Houston-NCALM P.S.
Start: 12-May-2014
End: 05-Jun-2022
Wang, Guoquan, 2014, HoustonNet GPS Network - UHEP-University of Houston-NCALM P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/T5P84958