The ninth largest employer of workers engaged in manufacturing is the paper and allied industries. The greatest number of such workers is engaged in the manufacturing of pulp. The largest pulp mills are located at Covington and Franklin. Approximately one-half of the nation's supply of wood pulp is furnished by the South and Virginia ranks fifth among the southern states in its production. The newly developed methods of utilizing southern pine for producing kraft paper and newsprint have caused considerable increase in this type of production. Kraft paper is usually dark brown in color and is a most durable type of wrapping paper. Such paper is manufactured at Covington, Franklin, West Point, Hopewell and Richmond. Other paper products such as gummed and waxed paper (Richmond), varied types of commercial envelopes and church collection envelopes (Richmond), multi-wall paper bags (Richmond, Franklin and Newport News) and paperboard containers--corrugated shipping cases, cartons, boxes of varied sizes and shapes (Richmond, Lynchburg) are likewise produced in abundance. Over 9,000 employees are engaged in the printing and publishing industry. Approximately one-half of these employees work in the printing and publishing of newspapers. These newspaper companies are scattered throughout the state. In addition, there are other companies which publish books, engage in commercial printing in general, in lithographing, bookbinding, plate printing, engraving and in photo engraving. These companies also are located in several areas with Richmond, Norfolk and Newport News having the greatest number of employees. Another industry important to Virginia's economic expansion is the stone, clay and glass production industry. Half of the employees in this industry are engaged in the manufacture of concrete and plaster products. An increase in local construction has resulted in an increase in the production of cinder blocks and other building materials. The following products are included: purchased glass products (example, mirrors)--Galax, Bassett, Richmond, Martinsville; hydraulic cement--Fordwick and Riverton; structural clay (brick and hollow tile)--Roanoke; pottery and china (lusterware)--Abingdon; flower pots and pans--Richmond; asbestos (automatic brake linings)--Winchester; stone products (marble and granite monumental stones)--Burkeville, Richmond, Roanoke and Danville; concrete products--Roanoke and Richmond; gypsum products--Plasterco and Norfolk; lime--Austinville and Kimballton; mineral wool--Riverton; soapstone and stone products--Schuyler; abrasives--Petersburg; and mica--Newport News.