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A document containing data or information about "primary documents".

A collection of works of various authors or of one author selected for a specific purpose or under specific aspects. Antolog	A printed list of documents containing formal descriptions of the documents. Bibliograf	An ordered compilation of bibliographic descriptions and sufficient information to afford access to the documents. Cat?logo
A list of persons or organizations systematically or alphabetically arranged giving some information about the single units, usually at least the addresses. Directorio	A survey of progress in a particular field of science over a given period. Estudio bibliogr?fico	An ordered reference list of the contents of a file or document together with references for identification or location of those contents. Indice
Inventario	A list of new acquisitions issued periodically. Lista de adquisiciones	Revista bibliogr?fica

Documento secundario