The following are Reference resources that allow searching in many encyclopedias and dictionaries at once. Not specific to one discipline, these are very useful for getting overviews and additional references from many sources.
Gale Virtual Reference Library offers online access to reference sources including encyclopedias, almanacs, series and more. UMBC titles cover biography, business, law, public health, economic history, ancient studies, and multicultural studies. Searches can also be done in subject categories or in individual titles.[ Title list ]
Access to over 300 reference works - in a single cross-searchable resource. Includes language, science and medicine, humanities and social sciences, and business. Select 'unlocked' and 'free' resources in availability for full access to content.