How did Noam Chomsky earn his Ph.D. in linguistics?

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Noam Chomsky wearing glasses and a dark sweater, looking slightly to the side during an interview. — Noam Chomsky American linguist and philosopher Noam Chomsky, 2010.

Noam Chomsky earned his Ph.D. in linguistics from the University of Pennsylvania in 1955. He fulfilled the requirements for the degree by submitting a single chapter of his work, The Logical Structure of Linguistic Theory (LSLT), as his doctoral dissertation, which was titled Transformational Analysis.1