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EspañaServicio de suministro de documentos del CINDOC
Extranjero
Solicitud electrónica de documetos de la Universitat de ValènciaThe British Library Document Supply Centre
OCLC Reference Services / OCLC FirstSearch service
Ariel Home Page
Institut d'Information Scientifique et Technique (INIST)
FIZ Karlsruhe and STN International
Document Delivery Vendors
International Federation of Library Associations
KR SourceOne Main Page