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Daily Mail Historical Archive
Complete archive of the Daily Mail newspaper (London, England), including all issues from 1896-2004, and the Atlantic editions 1923-1931.

DialNet
Online access to academic publications in Spanish.

Datastream
Global historical content on securities, companies, markets and economies globally.  Data ranges from 1960s in some cases to present day.  Information source include Government Departments, Stock Markets, OECD, IMF, Worldscope and Eurostat. 

Dictionary of Old English: A to I
Defines the vocabulary of the first six centuries (600 - 1150 A.D.) of the English language.

Dictionary of Old English Corpus
A complete record of surviving Old English except for some variant manuscripts of individual texts. There are 3,047 texts in the corpus.

DigiMap
Digimap is an online map and data service, including Ordnance Survey, Environment, Historic and Marine Collections [Requires individual registration].

Digital National Security Archive: Collections 1 – 59
Primary sources on United States foreign and military policy from 1945, comprising themed collections of declassified US government documents.