https://oi.uchicago.edu/research/research-archives-library
The Oriental Institute of Chicago
The Philosopher’s Inde: abbreviations, ISSN number and full titles of journals
https://philindex.org/about-us/publisher/
Thesaurus linguae graecae
http://stephanus.tlg.uci.edu/
Theses and Dissertations – Open Access
https://oatd.org/
Transactions of Congregational Historical Society
https://biblicalstudies.org.uk/articles_congregational-historical-society-1.php
Trismegistos: an interdisciplinary portal of the ancient world
https://www.trismegistos.org/tm/
Unione internazionale degli studi di archeologia storia e storia dell’arte in Roma
http://www.unioneinternazionale.it/
Unione Romana Biblioteche Scientifiche URBS
https://www.reteurbs.org/
United Nations
https://www.un.org/
Universität Tübingen
https://uni-tuebingen.de/