” … book by __ cover”

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Now we are looking on the crossword clue: ” … book by __ cover”.
it’s A 23 letters crossword puzzle definition. See the possibilities below.

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Possible Answers: ITS.

Random information on the term “ITS”:

ITS, the Incompatible Timesharing System (named in comparison with the Compatible Time-Sharing System also in use at MIT), was an early, revolutionary, and influential time-sharing operating system from MIT; it was developed principally by the Artificial Intelligence Laboratory at MIT, with some help from Project MAC.
Taken from Wikipedia