Treatises are the most useful type of secondary sources and are book-length expositions on the law as it pertains to a particular subject. Treatises may be scholarly in nature, or geared toward a legal practitioner, such as a manual or handbook. A legal treatise may be a short, single volume or a large, multi-volume set. Many are available electronically as well as in print. Different kinds of treatises have different purposes. Some treatises are designed to serve as practitioner tools. These works tend to address realistic legal problems and often include useful features such as forms and tables. Use the Library Catalog, Treatises by Topic and New York Treatises by Topic to find additional titles.