The reference materials that would probably not be helpful for the following assignment are Periodical, thesaurus, dictionary, librarian, biographies, and music index.
<h3>What do reference materials mean?</h3>
The reference materials may be defined as diverse sources that supply acquainted information or snappy facts on any provided topic.
The above-mentioned reference materials are not required for the completion of the assignment because these have no use.
If you want to create a slide show about the Amazon river you must require a bibliography, gazetteer, vertical file, encyclopedia, and telephone directory.
Therefore, it is well described above.
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