Etymology
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ex libris 
Latin, literally "out of the books (of)," from ex "out of" (see ex-) + ablative plural of liber "book" (see library). Hence, ex-librist (1880).
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Dewey Decimal system (n.)

library classification system that organizes information into 10 broad areas subdivided numerically into progressively smaller topics, by 1885, named for Melvil Dewey (1851-1931) who proposed it 1876 while acting librarian of Amherst College. He also crusaded for simplified spelling and the metric system.

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