R General works, Exhibitions, Patents Rd-Rg Extractive arts Rd Mining Re Metallurgy Rf Agriculture Rh Horticulture Ri Silviculture Rj Animaliculture Rq Chemic arts Rt Electric arts Ry Domestic arts Rz Food and Cookery S Constructive arts, Engineering Sg Building Sj Sanitary engineering Sl Hydraulic engineering St Transportation and Communication T Fabricative arts, Machinery, Manufacturing and Handicrafts U Protective arts, _i.e._ Military and Naval Arts, Life- preserving, Fire-fighting V Athletic and Recreative arts, Sports and Games Vs Gymnastics Vt Theatre Vv Music W Fine arts, plastic and graphic We Landscape gardening Wf Architecture Wk Casting, Baking, Firing Wm Drawing Wp Painting Wq Engraving Wr Photography Ws Decorative arts, including Costume X-Yf Communicative arts (by language) X Philology X Inscriptions X Language Y Literature Yf English Fiction Z Book arts (making and use of books) Za-Zk Production Za Authorship Zb Rhetoric Zd Writing Zh Printing Zk Binding Zl Distribution (Publishing and Bookselling) Zp Storage and Use (Libraries) Zu Description (Zu Bibliography; Zx Selection of reading; Zy Literary history; Zz National bibliography) This scheme is published separately as _Expansive Classification: the first six Expansions_, by C. A. Cutter, Boston, 1891, etc., and a seventh expansion of the work is being issued under the supervision of W. P. Cutter, nephew of the author, but no parts have been published for several years. =238. Library of Congress.=--This is the elaborate and detailed scheme applied to the great Library of Congress, and is the work of its classification department. Its outline (1909) is based upon that of the Expansive scheme of Cutter which is shown above, but is varied to meet what are thought to be the special needs of the American national library. Each of the classes has been published separately in convenient form with an index. The main classes and divisions of the Library of Congress Classification are as follows: A General Works. Polygraphy AC Collections. Series. Collected Works AE Encyclopædias AG General reference works (other than encyclopædias) AI Indexes AM Museums AN Newspapers AP Periodicals AS Societies. Academies AY Year-books. Almanacs AZ General history of knowledge and learning B Philosophy. Religion