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In addition to bound volumes, colleges may also offer online dictionaries and encyclopedias, which are useful for general overviews of topic areas (the encyclopedias) or for looking up the derivation of words in the case of a source like the Oxford English Dictionary. Common sources for a library to offer online are the Encyclopedia Britannica and the Oxford English Dictionary. Often these online sources will be available under a heading like “Reference Tools” or “Online Reference Sources,” which may be accessible from the library’s home page.