Manchester Medieval Sources Online
Collection of 39 edited and translated books providing key primary sources on medieval European history.

Mass Observation Online
Mass Observation Online makes available original manuscript and typescript papers created and collected by the Mass Observation organisation.  The organisation was founded in 1937 to create an 'anthropology of ourselves' and by recruiting a team of observers and a panel of volunteer writers they studied the everyday lives of ordinary people in Britain.

Maternity and Infant Care database (MIDIRS)
MIDIRS indexes English language journals, books, guidelines and grey literature in midwifery, pregnancy, labour, birth, postnatal care, infant feeding, neonatal care up to the age of two and the transition to parenthood.

MathSciNet is an electronic publication offering access to a carefully maintained and easily searchable database of reviews, abstracts and bibliographic information for much of the mathematical sciences literature.

Max Planck Encyclopedia of Public International Law (MPEPIL)
Legal reference work including 1,700+ scholarly articles on public international law, edited by Rüdiger Wolfrum.

Medline indexes journals in medicine, healthcare, nursing and allied health, health sciences and life sciences.

Mergent Archive
Contains more than 180,000 corporate documents covering over 100 countries and industries.  Coverage from 1909 onwards.

Migration to New Worlds
Collection of primary sources on the migration of people from Britain, Ireland and Europe to the New World and Australasia, primarily in the 18th and 19th centuries; including personal accounts, correspondance, oral histories, scrapbooks, shipping papers, logbooks and plans, reports and press releases, legal papers and travel tickets, leaflets and pamphlets, postcards and posters, photographs and maps.

Around 150 reports on UK markets within the following 7 streams: Drink, Food, Leisure, Lifestyles, Media, Retail: clothing and footwear and Travel.

MLA International Bibliography (MLAIB)
Over 1.8 million citations from more than 4,400 journals and 1,000 books covering the areas of literature, languages and the dramatic arts.

Monumenta Germaniae Historica (eMGH)
Collection of 3,700+ full-text Medieval texts on German and European history from 200AD to 1500AD.  It is published in 5 series (Scriptores, Leges, Diplomata, Epistolae and Antiquitates) over 300+ volumes.