Searched Miami's catalog and OhioLink and still can't find the book you want?
Request it through interlibrary loan.
Interlibrary loan will find a library that owns the book, and will request it on your behalf.
To request a book through interlibrary loan, fill out the online form: ill.lib.miamioh.edu/illiad/
Library of Congress call numbers group books by topic. Below are some call number ranges covering philosophy.