To, The Librarian, [School/College Name], [City]
Date: [Date]
Subject: Request for a [new/duplicate] library card
Respected Sir/Madam,
I am [Your Name] of Class [Class], Roll No. [Roll Number]. I wish to borrow books from the school library for my studies, but I [do not yet have a library card / have lost my library card].
Kindly issue me a [new/duplicate] library card at the earliest. [If lost: I am ready to pay the prescribed fine for the lost card.]
Thank you.
Yours obediently, [Your Name] Class [Class], Roll No. [Roll Number]