The sentences that do not use brackets correctly are:
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Known as the "Father of Tragedy," Aeschylus [525-456 BCE) was a prominent Greek playwright. (The opening bracket is incorrect; it should be a closing bracket.)
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Dr. Janusch began his experiments during the 1920s [See pages 33 and 34), but the turning point in his work came in 1935. (The closing bracket is incorrect; it should be an opening bracket.)
All other sentences use brackets correctly.