A call number is like a book's address; it tells you where to find a book in the library's collection. Call numbers are arranged alphabetically, and then by whole number (everything before the first period in the call number).
The following call number ranges are where you'll find most of our books on Environmental Studies. The Library of Congress Classification Outline provides a full guide to call numbers.
RT 0-120 - Nursing
RT 89-120 - Specialties in Nursing