This system invented in the 1870s to classify library books is now in its 23rd updated edition

Since you have landed on this page then most probably you are looking for the This system invented in the 1870s to classify library books is now in its 23rd updated edition answerThis question was last seen on June 21 2023 Jeopardy TV Game Show.

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For more questions from this episode visit Jeopardy June 21 2023 Answers