Academic libraries use the Library of Congress Classification System to designate a book's location on the shelf.
Some books about palliative and end-of-life care have a call number (on the spine of the book) that ranges from R726.5 - R726.8 (Medicine and disease in relation to Psychology. Terminal care. Dying.)
Some other common categories include the following:
R - Medicine
BF - Psychology
BJ - Ethics
HQ - The Family, Marriage, Women
HV - Social Pathology; Social and Public Welfare.
RH = Walsh Library at Rose Hill, Bronx
LC = Quinn Library at Lincoln Center
WC = Westchester Campus Library (Fordham Westchester Library)