• Encyclopedia of Geology, 2005-
• Encyclopedia of Geomagnetism and Paleomagnetism, 2007.
• Encyclopedia of Global Warming and Climate Change, 2008. 3 vols.
• Encyclopedia of Ocean Sciences, 2004-
• Encyclopedia of Quaternary Science, 2007-
• Encyclopedia of Soils in the Environment, 2004-
• Encyclopædia Britannica Online, 1900-
• Treatise on Geochemistry, 2004-

Scientific dictionaries

General

• Geology Dictionary Consult the geology dictionary for definitions, images and short articles about the most commonly used geological terms
• Intute: Earth Sciences Dictionaries and Encyclopaedias
• Answers.com: Science
• Wikipedia: Natural and physical sciences 
• Wikipedia: Earth sciences 
• Wikipedia: Geography and places

Subject

• Glossary of Glacier Terminology (USGS)

Dictionaries, general

• Dictionaries on AU and The State and University Library
• Online reference books for AU employees - in Danish

Danish

• Den Danske Online Ordbog (ddoo.dk)
• Den Danske Ordbog
• Fremmedord.dk
• Gyldendals Online Leksikon
• Ordbog over det danske sprog (ODS) Historical dictionary - 1700 till about 1950
• Retskrivningsordbogen
• Sproget.dk
• Wikipedia 

English

• Visual Dictionary Merriam-Webster. 6.000 pictures
• Merriam-Webster's Dictionary
• Wikipedia (English)

 Multilingual

• Ordbogen.com (Den Danske Netordbog) English, German, Spanish, Swedish, Portugese, Italian, and accounting.
• Sproget.dk Links to dictionaries and encyclopedias.
• Gyldendals online dictionaries Oxford Pro, English SUPER PRO, French PRO, Spanish PRO, German PRO Law - in Danish
• dict.cc Dictionary for multible languages, incl. english, german, french, danish, polish etc. The dictionary is user made.

Translation Tools

• Google Translate Translates text or websites from/to 23 languages.
• Babel Fish Translation