Finding an open access document

Finding an open access document
Extrait du Observatoire de Paris centre de recherche et enseignement en astronomie et
astrophysique relevant du Ministère de l'Enseignement supérieur et de la Recherche.
https://www.obspm.fr/finding-an-open-access.html
Finding an open access
document
Date de mise en ligne : mardi 19 février 2013
Observatoire de Paris centre de recherche et enseignement en astronomie et
astrophysique relevant du Ministère de l'Enseignement supérieur et de la
Recherche.
Copyright © Observatoire de Paris centre de recherche et enseignement en astronomie et astrophysique relevant du Ministère de l'Enseignement
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Finding an open access document
The catalogue of the Library indicates where the documents are, and how they can be
communicated.
The documents which are in store or in the reserve (Paris), or in the annex (Meudon), can be
accessed by filling in a request form.
At Meudon, most of the works are open-access, which is so for only a small fraction of the
documents on the Parisian site.
Journals are classed by an inventory numer, while books by the CDU code.
Classification of open-access works, CDU
The CDU system (Classification Décimale Universelle - Universal Decimal Classification) is based on the use of
arabic numbers. Classification is by theme, so that documents relating to the same main subject appear together on
the shelves.
The numerical code is followed b y three letters, usually the first three letters of the author's name. A decimal notation
is implied : the numbers are not to be thought of as integers, but as *decimals*, i.e. they are treated (and read) as if
they were preceded by 0 (zero, comma...). For example, the sequence of numbers 5, 52, 53, 510, 521, 536,
considered as decimals, will be classified in the following manner :
5
510
52
521
53
536
By convention, to ease reading the code, a point is included after every group of 3 numbers, for example :
523.035.24
There are also in addition various other signs and symbols : brackets ( ), the colon :, the dash -, the slash /
The principal themes found in the Library collection correspond to the following codes :
•
•
•
•
51 Mathematics
52 Astronomy-Astrophysics-Geodesy
53 Physics
54 Chemistry
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