Mai

MetaOpac Azalai italiano

Maia

MetaOpac di architettura

Marc

Machine readable cataloguing

Marvel

Machine-assisted realization of the virtual electronic library

Mbac

Ministero per i beni e le attività culturali

Mbca

Ministero per i beni culturali e ambientali

Medlars

Medical literature analysis and retrieval system

Mesh

Medical subject headings

Midas-Net

Multimedia information demonstration and support net

Mit

Massachusetts institute of technology

Miur

Ministero dell’istruzione, dell’università e della ricerca

Mla

Modern language association

Mpeg

Moving picture experts group

Mums

Multiple use Marc system

Murst

Ministero dell’università e della ricerca scientifica e tecnologica

Nal

National agricultural library

Nal

National art library

Nasa

National aeronautics and space administration

Ncsa

National center for supercomputing applications

Nic

Network information center

Nih

National institute of health

Nir

Network information retrieval

Nis

Network information service

Niso

National information standards organization

Nle

National library of education

Nlm

National library of medicine

Nls

National library of Scotland

Nsf

National science foundation

Nuc

National union catalog

Oai

Open archives initiative

Oclc

Online computer library center

Ocr

Optical character recognition

Oeb

Open e-book

One-2

Opac network in Europe 2

Opac

Online public access catalog

Opal

Online public access library

Osi

Open systems interconnection

Ota

Oxford text archive

Ovi

Opera del vocabolario italiano