Library of Congress Subject Headings Online

   The Library of Congress now has an abbreviated version of its subject headings system available online at http://authorities.loc.gov/  To use it, do the following:

        1. Click on "Search Authorities."
        2. Choose the Subject Headings option in the lower box, then type into the upper box a good guess
 for what the subject heading might be.  You will get a display of various related headings.
        3. If you see your term opposite a button that says "References," click on the References button . 

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Evangelism

LC subject headings

In the case of a search for "Evangelism" clicking on References leads to a page that will tell you that the proper heading is "Evangelistic Work:" 

If the subject heading you guessed is an authorized heading, the button opposite it will say "Authorized Heading."

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Evangelism plays

LC subject headings