what found at the library in Nineveh which enable historians to learn about life in the ancient middle east.

Correct answer is more than 30, 000 clay tablets that were discovered in the middle of 19th Century.

Explanation:

Nineveh was the capital of Assyrian Empire and one of the most important cities of the period. Still, the most important archeologic discovery from this city dates back to 1850s when this tablets written in cuneiform were found. They gave us a lot of information about everything that we need to know about the area around Mesopotamia from that period.