Encyclopedias, dictionaries, and other resources to help you discover basic information—names, dates, definitions, summaries, etc. These are good places to start when narrowing or choosing your topic, and when beginning research on an unfamiliar subject.
A Dictionary of Earth Sciences by 
The Encyclopedia of Astronomy and Astrophysics by 
Encyclopedia of Astronomy and Astrophysics by Search by background information in the library catalog
You can search the library catalog to find many more reference sources such as specialized encyclopedias. Perform a keyword search for your topic and add one of the words below.
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Union List of Astronomy Serials (ULAS)
Dictionary of Astronomy
