1. Books are for use.

2. Every reader, his/her book.

3. Every book, its reader.

4. Save the time of the reader.

5. The library is a growing organism.

 

Five Laws of Library Science

https://en.wikipedia.org/wiki/Five_laws_of_library_science

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Ranganathan's Relevant Rules

https://www.journals.ala.org/index.php/rusq/article/viewFile/4090/4658