The reference materials that would probably not be helpful for the following assignment are Periodical, thesaurus, dictionary, librarian, biographies, and music index.
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.
To learn more about Reference materials, refer to the link;
https://brainly.com/question/10143935
#SPJ1
