Britannica AcademicThis link opens in a new windowEncyclopædia Britannica's founded in 1768
Lex.dkThis link opens in a new windowSamlet indgang til flere leksikalske værker, bl.a.: Danmarks Oldtid, Danmarkshistorien.dk, Dansk Biografisk Leksikon, Nordisk Mytologi, Den Store Danske, Symbolleksikon, Trap Danmark (6. udg.).
Salmonsens konversationsleksikonThis link opens in a new windowDet er Projekt Runebergs digitale udgave af 2. udgaven af Salmonsens konversationsleksikon.
For bind 1-21 er Christian Blangstrup redaktør; Johs. Brøndum-Nielsen og Palle Raunkjær for bind 22-26.
Store Norske LeksikonThis link opens in a new windowEt oppslagsverk skrevet av fagfolk på bokmål og nynorsk
Trap Danmark (5. ed)This link opens in a new windowTrap Danmark (5th Edition) contains a precise description of Denmark, the Danish landscape, cities, history, nature, culture and institutions. The corpus stands as one of the most important Danish topographical works.
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Trap Danmark (6. ed)This link opens in a new windowThe 6th Edition of Trap Danmark, contains descriptions of Danish geology, geography, archeology, history, culture, art, architecture and of social as well as economical parameters.