The Assyrian clay tablet with inscription describing a treaty between Esarhaddon (reigned 681 - 669 BC) and Ba'al of Tyre was discovered in Archive of Assurbanipal Palace.
See:
- http://cdli.ucla.edu/search/search_results.php?SearchMode=Text&ObjectID=P336126
- Benjamin Noonan, Did Nehemiah Own Tyrian Goods? Trade between Judea and Phoenicia during the Achaemenid Period, 2011 - https://www.academia.edu/829037