The Additional Indexes
In Lesson 5 we looked at the Basic Index to refine our search to the most relevant information on the use of marine sponges to treat cancer.
Additional Indexes indicate how to narrow a search further by using information other than the subject of the search.
For example, we may want to find articles on a scientist's latest research. We may want to see in what journals the articles are being published. We may also want scientific data written only in the last year. In any of these cases, we will be searching Dialog's Additional Indexes.
In the Additional Indexes, we can see Prefixes, two-digit codes followed by an equal sign.
To
narrow a search or to find one specific piece of information, we can type the command:
s xx=<TERM>, where XX is the prefix. 
See the Additional Indexes for File 72 (EMBASE).
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