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<p>in order of increasing generality.</p>

<p>Communication Source combines Communication and Mass Media Complete and Communication Abstracts to provide full-text access to more than 700 journals, and indexing and abstracting for more than 1,000 core journals.  Coverage dating goes back to 1900. </p>

<p>Content is derived from academic journals, conference papers, conference proceedings, trade publications, magazines and periodicals. </p>

<p>A transmitter can be either a device, for example, an antenna, or a human transmitter, for example, a</p><p>
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