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If after hours, schedule a research consultation for reference help, or email the circulation desk for general questions.
Note: When searching for resources on non-English titles, there may be spelling variants. The official Library of Congress subject heading for the Shahnama is "Firdawsī. Shāhnāmah." The diacritics aren't normally vital though, so "Shanama," "Shahnamah," or "Shahnameh" would all work. In most databases, using "Shahnam*" (without quotations) should encompass most variants.
In book indexes, look under both Shanama (and variants) as well as Ferdowsi or Firdawsi.