![Information for Researchers - Using the Library of Congress](https://webarchive.library.unt.edu/eot2008/20081207212920im_/http://www.loc.gov/rr/main/images/inforeas-title.gif)
If an Item Is Not Delivered
If the book or periodical requested is not available, the call slip will be
returned to the researcher with a report indicating the reason. For further
information on the meaning of the report, consult a staff member at the book
service stations.
If a call slip comes back marked "N.O.S." (Not on Shelf), double check the
call number and bibliographic information for accuracy, completeness, and
legibility.
If the item was an issue of a periodical, consult a reference librarian to
find out whether the Library has received the issue and whether it has been
bound.
Then take the response to the Book Service desk in the Main
Reading Room or on the fifth
floor of the Adams Building and fill out a Special Search form. Library
staff will then conduct a comprehensive, long-term search for the missing
item over
a 30-day period. Staff can also help gain access to materials
that are charged to offices within the Library or are assigned to a reference
collection or other location. Reference staff may also be able to identify
other area libraries which have copies of an item in their collections.
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