The three rules of the Librarians of Time and Space are: 1) Silence; 2) Books must be returned no later than the last date shown; and 3) Do not interfere with the nature of causality.
 Terry Pratchett, Guards! Guards! (1989). copy citation

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Author Terry Pratchett
Source Guards! Guards!
Topic silence libraries rules librarians delay
Date 1989
Language English
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