In addition to our general rare book collections, the holdings of books and other printed material are organized in over one hundred special author or subject collections, focussing on fields as diverse as AIDS, Aristotle, Birdsall Bindings, Darwin, Aldous Huxley, Incunabula, Libretti, Petlice, Printed Ephemera and the Spanish Civil War. The great strengths of the Library lie in the fields of British, European and Canadian literature, philosophy, the history of science and medicine, Canadiana, and the history and art of the book.