Books in the University of Delaware Library are shelved by the Library of Congress classification system. Manga can be classified as either PL or PN and will be found on the second floor.
"Manga" is not a Library of Congress subject search term. For this reason, lists of this library's manga series titles in English translation and in Japanese are on this page for your convenience.
Alternatively, searching on the word "manga" in DELCAT will result in books about manga rather than examples of manga itself.