1. ONCE WE KNOW A BOOK IS AVAILABLE WE MUST BE ABLE TO FIND IT

2. EACH BOOK HAS A LABEL IN THE LIBRARY EVERY BOOK HAS ITS PLACE… AND THERE IS A PLACE FOR EACH BOOK

3. THE LIBRARY MARK IS ON THE LABEL THE MARK INDICATES ITS POSITION IN THE COLLECTION

4. THE MARKS ALLOWS YOU TO FIND THE BOOK. ITS HAS 3 ELEMENTS SUBJECT AUTHOR TITLE Subject Aeronáutica (629.7) Author A. Esteban Oñate Title Conocimientos del avión

5. THE BOOKS SUBJECT IS IDENTIFIED BY A NUMBER Example: 001.8 Science Methodology 512 Algebra 532 Fluid Mechanics 629.7 Aeronautical Engineering 681.3 Informatics

6. TO SPECIFY A SUBJECT, DIGITS ARE ADDED TO THE MAIN NUMBER SOME EXAMPLES: 5 – PURE SCIENCES, NATURAL SCIENCES 51 – Mathematics 512 – Algebra 512.64 – Linear Algebra 6 – APPLIED SCIENCES 62 – Engineering 629 – Transport Engineering 629.7 – Aeronautical Engineering 629.78 - Astronautics

7. THE BOOKS ARE ORDERED BY THEIR LABLES ON THE BOOKSHELFS

8. THE LABELS ARE ORDERED FOLLOWING THE 3 FIGURES THAT ARE INCLUDED IN THEM

9. THE CONTENT OF EACH BOOK SHELF IS INDICATED

10. THERE ARE OTHER NUMBERS THAT ARE APPLIED TO ALL SUBJECTS (03) Dictionaries, encyclopedias (058) Directories, yearbooks (076) Problems (091) History Example: 33 (03)Diccionario de economía 512(076) Problemas de álgebra 629.7(091) Historia de la aeronáutica

11. ON THE BOOKSHELFS, THE BOOKS ARE ORDERED FROM LEFT TO RIGHT AND FROM TOP TO BOTTOM

12. BOOKSHELFS ORDER IN THE LIBRARY